New Circuits Page 159
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This circuit is similar to the one above but uses positive feedback to get a little more amplitude to the speaker. I copied it from a small 5 transistor radio that uses a 25 ohm speaker. In the circuit above, the load resistor for the driver transistor is....
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Installing a water depth OEM sensor that is a solid state, continuous fluid level sensor. The sensor provides a resistive output that is inversely proportional to the level of the liquid: the lower the liquid level, the higher the output resistance; the....
-
When developing a battery charger, using a real battery might be inconvenient. The battery simulator circuit described here is an alternative. The battery input positive and negative terminals should be connected in place of the battery in the charger....
-
This is Xenon Strobe Light circuit, model continual use a tube Xenon at give many brightnesses. By can fine blink fast or slow get , with VR1. By have SCR...
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The AD654 is a monolithic V/F converter consisting of an input Amplifier a precision Oscillator system, and a high current output stage. A single RC network is all that is required to set up any full scale (FS) frequency up to 500 kHz and any FS input....
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This GSM Mobile is used for our Remote Control (for example Gate Control, Temperature Control . ). We use the word module` because, unlike what we did in ourremote control projects, this time around the mobile phone is not mounted on a printed board, but....
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Originally Posted by ide2003 Hi intensate, I`ve been in your shoes before. If you want no op-amp all together I highly recommends you to have ECDesign`....
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Hi, I`m working towards an hybrid amplifier where the VAS will be the Aikido, where the OPS is some Emitter-Follower variation. Unfortunately my....
-
-
This two-stage design makes use of enhancement-mode pHEMT device technology to serve IEEE 802.11a, HiperLAN2, and HiSWANa local-area-network receivers....
-
-
-
The DE2 board is equipped with an Analog Devices ADV7181 TV decoder chip. The ADV7181 is an integrated video decoder that automatically detects and converts a standard analog baseband television signal (NTSC, PAL, and SECAM) into 4:2:2 component video data....
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Power op amps provide accurate speed control for dc motors. The circuit provides bidirectional speed control. The amplifiers` push-pull configuration ensures a full rail-to-rail voltage swing (minus the output stages` saturation drops) across the motor in....
-
-
The servo motor is designed as one kind of traditional motor. It is the execution component of the automatic device. The most important feature of the servo motor is the controllable feature. When there is the control signal the servo motor turns, and the....
-
The video amplifier in the diagram is a well-known design. Simple, yet very useful, were it not for the ease with which the transistors can be damaged if the potentiometers (black level and signal amplitude) are in their extreme position. Fortunately, this....
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-
The circuit is here as it is of high educational value. I have not tested it. You can `simulate and test` or `wire it up and try` and let me know how it worked. The Circuit is also a simple analog to digital converter. You can use optos in place of LEDs. T1....
-
The Tone generator was a simple project built as a test unit for a customer design job. We use two analog switches controlled by the microprocessor code - one switch controls the signal going to the op-amp that drives the output, the other switch actually....
-
Some circuits need a negative supply voltage that only has to supply a small current. Providing a separate transformer winding for this (possibly even with a rectifier and filter capacitor) would be a rather extravagant solution. It can also be done using a....
-
The PLL pulse generator is shown as the chart. The circuit is the phase-locked loop (PLL) pulse generator circuit. PLL makes a fractional frequency to crystal oscillator and gets 1kHz stepped frequency signal, moreover, it obtains 10kHz 999kHz pulse waveform....
-
Building a small circuit to turn on/off a 200W heater. I am using a MOC3023 and a BT136. At the datasheet of the the optotriac, this circuit is recommended: My question is how is the 180Ohm resistor value determined. I understand that it conducts for a very....
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Multi Tone Alarm Description This is a simple and easy to build multi tone alarm circuit that can be used in burglar alarms or sirens. The circuit is based on dual op amp MC1458 and LM 380. The two op amps inside the MC 1458 are used to produce square and....
-
The amplifier feeds a brace of speakers with two LM3876 amplifier chip circuits (50 watts per channel), or a brace of headphones Meier Crossfeed through a clarify and a bifold OPA2134 Opamp. There are four selectable band inputs, and achievement buffers with....
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This application note describes the addition of a quad serial controller to the EB675001 Module. A multi source quad Universal Asyncronous Reciver and Transmitter (UART), 16554 type, was selected to ease implementation and sourcing of components. The RS232....
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So I had a lot of trouble figuring out that the Source pin goes to low voltage (source of electrons) and the Drain pin goes to high voltage (absorbs electrons). Basic electricity, but it still took me a while...
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Although you don`t find SCR and Triac in all electronic equipment, this does not mean that both are not important components. You need to learn how to test it so that when you come across one in the future you will know if it is good or bad during....
-
-
For measurement purposes in the electronics laboratory is needed again and again signals of different frequency and waveforms. A common function generator provides sine, for example, triangular and square waves. The frequency must be adjustable and at least....
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Originally Posted by CliffBrown Sal Thanks for the reply. If the plugs could be purchased and the signals fed to the PC with the software you`re using ....
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I have recently stumbled upon some LED strip at my local electronics shop and decided to give them a try. I bought some which I used to replace the spot lights in the kitchen. It is cold white, which is surprisingly good, especially for night time....
-
This is a design project of an air-filter sensor to be used in home heating and cooling system. The project includes conceptual design, analysis, implementation, tests and modifications. First, the air quality and power consumption between a clean air filter....
-
-
This circuit is a laser alarm system like the one we see in various movies. It uses a laser pointer beam to secure your valuables and property. Essentially, when the beam gets interrupted by a person, animal or object, the resistance of a photodiode will....
-
Consists essentially of 60-Hz sine-wave oscillator with 10K frequency-control pot, two buffer stages, and push-pull power amplifier. Circuit eliminates noise problems of square-wave inverters when operating 115-V radio receiver or cassette player in car.- G.....
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How to design an antenna for the MICORE contactless reader IC family. (The MIFORE reader IC family includes the MF RC500, MF RC530, MF RC531, SL RC 400 and the CL RC 632. The antenna design and matching is the same for all of these ICs. ) For a good overview....
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The USB-RS422-PCB is a USB to RS422 level serial UART converter PCB incorporating FTDI`s FT232RQ USB to Serial UART Interface IC device which handles all the USB signalling and protocols. The PCB provides a fast, simple way to connect devices with a RS422....
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This is a simple alarm circuit which produces a musical tone when water or some conducting liquid comes in contact with the two sensor wires provided. The circuit is based on four transistors and one melody generator IC (M 3482). When water comes in contact....
-
Inside the outdoor box to which the loop is mounted showing the amplifier circuitry. The four capacitors visible at the lower-left corner of the perfboard are used to broadly resonate the receive loop. In the office building in which he worked (a city....
-
The equalizer presented in this article is suitable for use with hi-fi installations, public-address systems. mixers and electronic musical instruments. The relay contacts at the inputs and outputs, in conjunction with S2, enable the desired channel to be....
-
A block diagram of the Commodore 64 internal power supply (how the +12V, +9V and TOD clock signals are generated from the 9V AC input). Taken from the SAMS C64 Troubleshooting Guide. Commodore 64 schematic diagram, scanned with 360 DPI, 2 colours. This seems....
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Yesterday we covered the Dangerous DSO analog front end. This circuit divides our +/-10volt input to +/-0.5volts, and re-centers it between the 2volt and 3volt range the ADC can measure. Today we`ll simulate the circuit to get a better feel for how it works.....
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This PIC16F877 microcontroller tutorial answers the question, ""How to interface LCD in 4bit mode with PIC16F877"" ? Also, using PIC16 simulator (Proteus) y....
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Page 1 of 2 - Frog polarisation - any interest from others in a custom PCB? - posted in Electrics (non-DCC): Greetings I am very slowly building a fairly large layout by myself and despite the allegation that DCC makes for only a two-wire wiring requirement....
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-
-
The analog interface is a very simple analog to digital converter which accepts the analog video output of the RF/IF board and puts it into a form that can be read by a PC Games port. The joystick input of the games port essentially converts a resistance in....
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The sound produced imitates the rise and fall of an American police siren. When first switched on the 10u capacitors is discharged and both transistors are off. When the push button switch is pressed to 10u capacitor will charge via the 22k resistor. This....
-
This circuit is a dual low/floating/high logic state detector which enables you to see the logic state of a digital signal pin. Each detector has two LEDs (typically a red and a green one) which indicate the state: red LED for high state, green LED for low....
-
This lead acid battery charger circuit is designed in response to a request from Mr. Devdas. C. His requirement was a circuit to charge two 12V/7AH lead acid batteries in series. Anyway he did not mentioned the no of cells per each 12V battery. The no of....
-
-
-
I describe the procedure I followed to build the Box, the Lamp System and the Countdown System which is based on the AVR mega8 microcontroller. Four blacklight lamps, 15W each, emit radiation at the region of UVA, with a peak around 350nm where the thin....
-
-
Detecting colour of an object can be an interesting and useful electronic application. It can be realized using a colour sensor like TCS3200 and a general purpose microcontroller like AVR ATmega32. TCS3200 chip is designed to detect the colour of light....
-
This high power class D audio amplifier electronic project is designed using the TDA8920BTH audio power amplifier IC. This power amplifier audio IC has a very high efficiency with very low dissipation, providing a very high output power. The typical output....
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This circuit`s frequency of oscillation increases directly with light intensity. The greater the light intensity, the higher the frequency of the oscillator. The 555 timer operates in the astable oscillator mode where frequency and duty cycle are controlled....
-
The circuit given below is of a simple audio amplifier that can deliver 12W to an 8 Ohm speaker. Op amp IC TL081 is used as the preamplifier here. Actually any opamp with matching power supply ratings can be used instead of TL081. Transistors Q1 and Q2....
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A simple synthesised 13cm ATV exciter my thoughts turned to what could be used as a power amplifier. The exciter produces about 10mW perhaps enough to drive some sort of MMIC or hybrid amplifier. The problem with 13cm is that at 2. 3 GHz and beyond devices....
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The diagram is human infrared remote sensing lamp circuit. It uses trace infrared heat sent out by human to remote control the open or close of lap. This human infrared remote sensing lamp trigger sensitivity is very high ( can work in 10m distance),....
-
This is the circuit diagram of a two channel audio line driver using the high performance dual opamp IC TSH22 from ST Microelectronics. The 25 MHz bandwidth, low distortion and high output current of the IC makes it possible to drive medium impedance loads....
-
There are two major types of backlights for LCDs: LEDs, which stands for light emitting diode, or EL, which stands for electroluminescent. EL backlights tend to be more efficient and have more uniform lighting than LED ones, but they require some tricky....
-
When the motor is connected in this fashion, the netduino activates the transistor, but nothing happens. If i swap the motor with an LED, the LED does light up, so that incidates that the motor isnt getting enough power. So i connect the motor direct to....
-
The delay circuit is shown in Figure 1, and uses the Mitsubishi M65830 Digital Delay chip. This has been around for a while now, and is simple and effective (provided that a fixed delay is acceptable). The serial data required to obtain different delay....
-
The water sensor circuit is based on a 555 timer circuit and come common electronic components. The water sensor is made by two metal electrodes arranged very close that a drop of water (liquid) will bridge them. If the liquid ( water ) is very pure you may....
-
For many applications it is necessary to delay signals. Just think of applications in automation and control systems. Such a signal delay circuit can be set up with two monoflops....
-
Dual adjustable power supply circuit with diagram using IC LM 317 and LM 337. This variable power supply circuit has a range of 1.2 Volts to 30 Volts....
-
If a circuit is to switch a mains voltage, a relay is a simple solution in cases where switching times are long and high currents are involved. However, a....
-
Hello, i want to make a simple active mixer to place in front of the power amp. I read some documents about active op-amp mixer.And they said : Any....
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Hi Ben. You need to connect pins 1 and 13 of the 4053 to the virtual ground rail (top of C4), not the circuit`s 0V rail. The way you have it, when the ....
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This is a fm radio receiver circuit which can be used with PC.PC radio REGULATIONSA) With the P1 we regulate the intensity of sound.B) With the P2 we regulate the frequency of reception.C) Optionally: If you want to check the frequency with your PC it will....
-
-
The following circuit shows about Alarm Power Supply Circuit Diagram. Features: 1-amp current, suitable for the Modular Burglar Alarm, 12-volts ....
-
A Simple Light activated switch This is the circuit diagram of a light activated switch based on National Semiconductors comparator IC LM 311 and a LDR. The circuit is based on a voltage comparator circuit wired around IC 1. The non inverting in put of IC1....
-
This DIY lightning detector circuit is a very sensitive static electricity detector that can provide an early warning of approaching storms from inter-cloud discharge well before an earth-to-sky return strike takes place. An aerial (antenna) formed of a....
-
To create the two laser guns for our game, we wanted to mount red lasers into some kind of modifiable toy guns that players could hold and shoot with. Fortunately, we found small red lasers from Fry`s that the target photocells can consistently successfully....
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-
-
Check out this specialized test gadget that tests continuity quantitatively in both AC and DC modes; it could prove to be an indispensable general bench test instrument....
-
For a while I have wanted to add a facility for hazard flashers to my Bonneville SE. I have read a couple of threads on this forum about the subject but not found anything which works like hazards should. I have therefore devised my own add-on system, which....
-
This instructable started with my previous camera hack making a remote shutter release. I found a 555 timer tutorial and realized how great it would b....
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The servo motor speed control circuit connects the photoelectric encoder with the motor shaft, the LED is the indicator light of the PLL detection, it turns on when the control circuit is synchronous. The PLL is the phase synchronous control method of the....
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A tutorial on setting up RS232 communication to PICAXE with circuit diagram, serial cable configuration, PC communication program setup and configuration and sample code for PICAXE....
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I wanted to teach my Arduino to talk telephone, so I added a HT9000A DTMF chip to produce the familiar "touch tones" (upcoming projects will act upon "heard" DTMF tones, but with a different chip). The output is really low volume, so you may want to plug in....
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A unit which is often very useful, if we need to isolate, in sound circuits, two stage between them. Then we can use this circuit which has an amplified unit, which gain X1, we do not use total negative feedback, only local, with the result that distortion....
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Here the circuit diagram of simple and easy made battery level indicator. In general, in mobile phones, the battery levels is displayed in dot or bar style. This helps you to effortlessly acknowledge the battery level. On this page we provi....
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This light sensitive circuit can operate a relay to switch on lamps or any AC loads when it senses darkness. It is ideal to use as switch less night lamps....
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This is a great intercom circuit that can be used in many ways. It uses 22V to operate and maybe it will work at a lower voltage (you can try it). For input/output it uses a loundspeaker (20-45 Ohm) on each side....
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The circuit diagram shown here is a very sensitive wireless relay switch that can be used to control the working of home appliances like flush system, hand dryer or else. The wireless switch described here needs no remote control for its working. You only....
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An active component, a CDTA, can be used as the basis for a variety of different filter responses, selecting the different responses by changing bias current to the amplifier....
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Crystal oscillator works as 51MHz crystal( the third harmonic of 17MHz). According to the different structures, the drain - gate capacitance can be selected between 0.5 to 1.8 pF. L2`s turns are about 20% of the L1. 470 ? source resistor can change the....
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Does anyone know where I can get a schematic for a USB to SPDIF converter, like the ones from empirical audio. Thanks!!! I like their concept but $500 ....
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Tetsuo Kogawa`s circuit is pretty well documented, but not in conventional schematic form. I decided to enter it into LTSpice to see what it could make of it, and decided to go ahead and put the schematic online here, with perhaps a few comments: I`ve set....
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In this circuit a standard op-amp is wired as an astable multivibrator. The output is non-symmetrical but has the advantage that the timing is controlled by only 1 resistor and capacitor, in this case, the 100k variable resistor, U2 and 100u capacitor C1.....
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A sound level meter circuit with diagram and schematic using IC LM 3915,which is an audio level measurement chip.Used to display amplifier sound level or a microphone sound level....
This circuit is similar to the one above but uses positive feedback to get a little more amplitude to the speaker. I copied it from a small 5 transistor radio that uses a 25 ohm speaker. In the circuit above, the load resistor for the driver transistor is....
Installing a water depth OEM sensor that is a solid state, continuous fluid level sensor. The sensor provides a resistive output that is inversely proportional to the level of the liquid: the lower the liquid level, the higher the output resistance; the....
When developing a battery charger, using a real battery might be inconvenient. The battery simulator circuit described here is an alternative. The battery input positive and negative terminals should be connected in place of the battery in the charger....
This is Xenon Strobe Light circuit, model continual use a tube Xenon at give many brightnesses. By can fine blink fast or slow get , with VR1. By have SCR...
The AD654 is a monolithic V/F converter consisting of an input Amplifier a precision Oscillator system, and a high current output stage. A single RC network is all that is required to set up any full scale (FS) frequency up to 500 kHz and any FS input....
This GSM Mobile is used for our Remote Control (for example Gate Control, Temperature Control . ). We use the word module` because, unlike what we did in ourremote control projects, this time around the mobile phone is not mounted on a printed board, but....
Originally Posted by ide2003 Hi intensate, I`ve been in your shoes before. If you want no op-amp all together I highly recommends you to have ECDesign`....
Hi, I`m working towards an hybrid amplifier where the VAS will be the Aikido, where the OPS is some Emitter-Follower variation. Unfortunately my....
This two-stage design makes use of enhancement-mode pHEMT device technology to serve IEEE 802.11a, HiperLAN2, and HiSWANa local-area-network receivers....
The DE2 board is equipped with an Analog Devices ADV7181 TV decoder chip. The ADV7181 is an integrated video decoder that automatically detects and converts a standard analog baseband television signal (NTSC, PAL, and SECAM) into 4:2:2 component video data....
Power op amps provide accurate speed control for dc motors. The circuit provides bidirectional speed control. The amplifiers` push-pull configuration ensures a full rail-to-rail voltage swing (minus the output stages` saturation drops) across the motor in....
The servo motor is designed as one kind of traditional motor. It is the execution component of the automatic device. The most important feature of the servo motor is the controllable feature. When there is the control signal the servo motor turns, and the....
The video amplifier in the diagram is a well-known design. Simple, yet very useful, were it not for the ease with which the transistors can be damaged if the potentiometers (black level and signal amplitude) are in their extreme position. Fortunately, this....
The circuit is here as it is of high educational value. I have not tested it. You can `simulate and test` or `wire it up and try` and let me know how it worked. The Circuit is also a simple analog to digital converter. You can use optos in place of LEDs. T1....
The Tone generator was a simple project built as a test unit for a customer design job. We use two analog switches controlled by the microprocessor code - one switch controls the signal going to the op-amp that drives the output, the other switch actually....
Some circuits need a negative supply voltage that only has to supply a small current. Providing a separate transformer winding for this (possibly even with a rectifier and filter capacitor) would be a rather extravagant solution. It can also be done using a....
The PLL pulse generator is shown as the chart. The circuit is the phase-locked loop (PLL) pulse generator circuit. PLL makes a fractional frequency to crystal oscillator and gets 1kHz stepped frequency signal, moreover, it obtains 10kHz 999kHz pulse waveform....
Building a small circuit to turn on/off a 200W heater. I am using a MOC3023 and a BT136. At the datasheet of the the optotriac, this circuit is recommended: My question is how is the 180Ohm resistor value determined. I understand that it conducts for a very....
Multi Tone Alarm Description This is a simple and easy to build multi tone alarm circuit that can be used in burglar alarms or sirens. The circuit is based on dual op amp MC1458 and LM 380. The two op amps inside the MC 1458 are used to produce square and....
The amplifier feeds a brace of speakers with two LM3876 amplifier chip circuits (50 watts per channel), or a brace of headphones Meier Crossfeed through a clarify and a bifold OPA2134 Opamp. There are four selectable band inputs, and achievement buffers with....
This application note describes the addition of a quad serial controller to the EB675001 Module. A multi source quad Universal Asyncronous Reciver and Transmitter (UART), 16554 type, was selected to ease implementation and sourcing of components. The RS232....
So I had a lot of trouble figuring out that the Source pin goes to low voltage (source of electrons) and the Drain pin goes to high voltage (absorbs electrons). Basic electricity, but it still took me a while...
Although you don`t find SCR and Triac in all electronic equipment, this does not mean that both are not important components. You need to learn how to test it so that when you come across one in the future you will know if it is good or bad during....
For measurement purposes in the electronics laboratory is needed again and again signals of different frequency and waveforms. A common function generator provides sine, for example, triangular and square waves. The frequency must be adjustable and at least....
Originally Posted by CliffBrown Sal Thanks for the reply. If the plugs could be purchased and the signals fed to the PC with the software you`re using ....
I have recently stumbled upon some LED strip at my local electronics shop and decided to give them a try. I bought some which I used to replace the spot lights in the kitchen. It is cold white, which is surprisingly good, especially for night time....
This is a design project of an air-filter sensor to be used in home heating and cooling system. The project includes conceptual design, analysis, implementation, tests and modifications. First, the air quality and power consumption between a clean air filter....
This circuit is a laser alarm system like the one we see in various movies. It uses a laser pointer beam to secure your valuables and property. Essentially, when the beam gets interrupted by a person, animal or object, the resistance of a photodiode will....
Consists essentially of 60-Hz sine-wave oscillator with 10K frequency-control pot, two buffer stages, and push-pull power amplifier. Circuit eliminates noise problems of square-wave inverters when operating 115-V radio receiver or cassette player in car.- G.....
How to design an antenna for the MICORE contactless reader IC family. (The MIFORE reader IC family includes the MF RC500, MF RC530, MF RC531, SL RC 400 and the CL RC 632. The antenna design and matching is the same for all of these ICs. ) For a good overview....
The USB-RS422-PCB is a USB to RS422 level serial UART converter PCB incorporating FTDI`s FT232RQ USB to Serial UART Interface IC device which handles all the USB signalling and protocols. The PCB provides a fast, simple way to connect devices with a RS422....
This is a simple alarm circuit which produces a musical tone when water or some conducting liquid comes in contact with the two sensor wires provided. The circuit is based on four transistors and one melody generator IC (M 3482). When water comes in contact....
Inside the outdoor box to which the loop is mounted showing the amplifier circuitry. The four capacitors visible at the lower-left corner of the perfboard are used to broadly resonate the receive loop. In the office building in which he worked (a city....
The equalizer presented in this article is suitable for use with hi-fi installations, public-address systems. mixers and electronic musical instruments. The relay contacts at the inputs and outputs, in conjunction with S2, enable the desired channel to be....
A block diagram of the Commodore 64 internal power supply (how the +12V, +9V and TOD clock signals are generated from the 9V AC input). Taken from the SAMS C64 Troubleshooting Guide. Commodore 64 schematic diagram, scanned with 360 DPI, 2 colours. This seems....
Yesterday we covered the Dangerous DSO analog front end. This circuit divides our +/-10volt input to +/-0.5volts, and re-centers it between the 2volt and 3volt range the ADC can measure. Today we`ll simulate the circuit to get a better feel for how it works.....
This PIC16F877 microcontroller tutorial answers the question, ""How to interface LCD in 4bit mode with PIC16F877"" ? Also, using PIC16 simulator (Proteus) y....
Page 1 of 2 - Frog polarisation - any interest from others in a custom PCB? - posted in Electrics (non-DCC): Greetings I am very slowly building a fairly large layout by myself and despite the allegation that DCC makes for only a two-wire wiring requirement....
The analog interface is a very simple analog to digital converter which accepts the analog video output of the RF/IF board and puts it into a form that can be read by a PC Games port. The joystick input of the games port essentially converts a resistance in....
The sound produced imitates the rise and fall of an American police siren. When first switched on the 10u capacitors is discharged and both transistors are off. When the push button switch is pressed to 10u capacitor will charge via the 22k resistor. This....
This circuit is a dual low/floating/high logic state detector which enables you to see the logic state of a digital signal pin. Each detector has two LEDs (typically a red and a green one) which indicate the state: red LED for high state, green LED for low....
This lead acid battery charger circuit is designed in response to a request from Mr. Devdas. C. His requirement was a circuit to charge two 12V/7AH lead acid batteries in series. Anyway he did not mentioned the no of cells per each 12V battery. The no of....
I describe the procedure I followed to build the Box, the Lamp System and the Countdown System which is based on the AVR mega8 microcontroller. Four blacklight lamps, 15W each, emit radiation at the region of UVA, with a peak around 350nm where the thin....
Detecting colour of an object can be an interesting and useful electronic application. It can be realized using a colour sensor like TCS3200 and a general purpose microcontroller like AVR ATmega32. TCS3200 chip is designed to detect the colour of light....
This high power class D audio amplifier electronic project is designed using the TDA8920BTH audio power amplifier IC. This power amplifier audio IC has a very high efficiency with very low dissipation, providing a very high output power. The typical output....
This circuit`s frequency of oscillation increases directly with light intensity. The greater the light intensity, the higher the frequency of the oscillator. The 555 timer operates in the astable oscillator mode where frequency and duty cycle are controlled....
The circuit given below is of a simple audio amplifier that can deliver 12W to an 8 Ohm speaker. Op amp IC TL081 is used as the preamplifier here. Actually any opamp with matching power supply ratings can be used instead of TL081. Transistors Q1 and Q2....
A simple synthesised 13cm ATV exciter my thoughts turned to what could be used as a power amplifier. The exciter produces about 10mW perhaps enough to drive some sort of MMIC or hybrid amplifier. The problem with 13cm is that at 2. 3 GHz and beyond devices....
The diagram is human infrared remote sensing lamp circuit. It uses trace infrared heat sent out by human to remote control the open or close of lap. This human infrared remote sensing lamp trigger sensitivity is very high ( can work in 10m distance),....
This is the circuit diagram of a two channel audio line driver using the high performance dual opamp IC TSH22 from ST Microelectronics. The 25 MHz bandwidth, low distortion and high output current of the IC makes it possible to drive medium impedance loads....
There are two major types of backlights for LCDs: LEDs, which stands for light emitting diode, or EL, which stands for electroluminescent. EL backlights tend to be more efficient and have more uniform lighting than LED ones, but they require some tricky....
When the motor is connected in this fashion, the netduino activates the transistor, but nothing happens. If i swap the motor with an LED, the LED does light up, so that incidates that the motor isnt getting enough power. So i connect the motor direct to....
The delay circuit is shown in Figure 1, and uses the Mitsubishi M65830 Digital Delay chip. This has been around for a while now, and is simple and effective (provided that a fixed delay is acceptable). The serial data required to obtain different delay....
The water sensor circuit is based on a 555 timer circuit and come common electronic components. The water sensor is made by two metal electrodes arranged very close that a drop of water (liquid) will bridge them. If the liquid ( water ) is very pure you may....
For many applications it is necessary to delay signals. Just think of applications in automation and control systems. Such a signal delay circuit can be set up with two monoflops....
Dual adjustable power supply circuit with diagram using IC LM 317 and LM 337. This variable power supply circuit has a range of 1.2 Volts to 30 Volts....
If a circuit is to switch a mains voltage, a relay is a simple solution in cases where switching times are long and high currents are involved. However, a....
Hello, i want to make a simple active mixer to place in front of the power amp. I read some documents about active op-amp mixer.And they said : Any....
Hi Ben. You need to connect pins 1 and 13 of the 4053 to the virtual ground rail (top of C4), not the circuit`s 0V rail. The way you have it, when the ....
This is a fm radio receiver circuit which can be used with PC.PC radio REGULATIONSA) With the P1 we regulate the intensity of sound.B) With the P2 we regulate the frequency of reception.C) Optionally: If you want to check the frequency with your PC it will....
The following circuit shows about Alarm Power Supply Circuit Diagram. Features: 1-amp current, suitable for the Modular Burglar Alarm, 12-volts ....
A Simple Light activated switch This is the circuit diagram of a light activated switch based on National Semiconductors comparator IC LM 311 and a LDR. The circuit is based on a voltage comparator circuit wired around IC 1. The non inverting in put of IC1....
This DIY lightning detector circuit is a very sensitive static electricity detector that can provide an early warning of approaching storms from inter-cloud discharge well before an earth-to-sky return strike takes place. An aerial (antenna) formed of a....
To create the two laser guns for our game, we wanted to mount red lasers into some kind of modifiable toy guns that players could hold and shoot with. Fortunately, we found small red lasers from Fry`s that the target photocells can consistently successfully....
Check out this specialized test gadget that tests continuity quantitatively in both AC and DC modes; it could prove to be an indispensable general bench test instrument....
For a while I have wanted to add a facility for hazard flashers to my Bonneville SE. I have read a couple of threads on this forum about the subject but not found anything which works like hazards should. I have therefore devised my own add-on system, which....
This instructable started with my previous camera hack making a remote shutter release. I found a 555 timer tutorial and realized how great it would b....
The servo motor speed control circuit connects the photoelectric encoder with the motor shaft, the LED is the indicator light of the PLL detection, it turns on when the control circuit is synchronous. The PLL is the phase synchronous control method of the....
A tutorial on setting up RS232 communication to PICAXE with circuit diagram, serial cable configuration, PC communication program setup and configuration and sample code for PICAXE....
I wanted to teach my Arduino to talk telephone, so I added a HT9000A DTMF chip to produce the familiar "touch tones" (upcoming projects will act upon "heard" DTMF tones, but with a different chip). The output is really low volume, so you may want to plug in....
A unit which is often very useful, if we need to isolate, in sound circuits, two stage between them. Then we can use this circuit which has an amplified unit, which gain X1, we do not use total negative feedback, only local, with the result that distortion....
Here the circuit diagram of simple and easy made battery level indicator. In general, in mobile phones, the battery levels is displayed in dot or bar style. This helps you to effortlessly acknowledge the battery level. On this page we provi....
This light sensitive circuit can operate a relay to switch on lamps or any AC loads when it senses darkness. It is ideal to use as switch less night lamps....
This is a great intercom circuit that can be used in many ways. It uses 22V to operate and maybe it will work at a lower voltage (you can try it). For input/output it uses a loundspeaker (20-45 Ohm) on each side....
The circuit diagram shown here is a very sensitive wireless relay switch that can be used to control the working of home appliances like flush system, hand dryer or else. The wireless switch described here needs no remote control for its working. You only....
An active component, a CDTA, can be used as the basis for a variety of different filter responses, selecting the different responses by changing bias current to the amplifier....
Crystal oscillator works as 51MHz crystal( the third harmonic of 17MHz). According to the different structures, the drain - gate capacitance can be selected between 0.5 to 1.8 pF. L2`s turns are about 20% of the L1. 470 ? source resistor can change the....
Does anyone know where I can get a schematic for a USB to SPDIF converter, like the ones from empirical audio. Thanks!!! I like their concept but $500 ....
Tetsuo Kogawa`s circuit is pretty well documented, but not in conventional schematic form. I decided to enter it into LTSpice to see what it could make of it, and decided to go ahead and put the schematic online here, with perhaps a few comments: I`ve set....
In this circuit a standard op-amp is wired as an astable multivibrator. The output is non-symmetrical but has the advantage that the timing is controlled by only 1 resistor and capacitor, in this case, the 100k variable resistor, U2 and 100u capacitor C1.....
A sound level meter circuit with diagram and schematic using IC LM 3915,which is an audio level measurement chip.Used to display amplifier sound level or a microphone sound level....
