New Circuits Page 66
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As electrolytic capacitors age, their internal resistance, also known as "equivalent series resistance" (ESR), gradually increases. This can eventually lead to equipment failure. Using this design, you can measure the ESR of suspect capacitors as well as....
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Low-drain circuit operating from 1. 5-V cell uses National LM3909 flasher IC to simulate fire-alarm siren. Pressing button produces rapidly rising wail, with tone coasting down in frequency after button is released. Sound from loudspeaker resembles that of....
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-
The integrated chip LM386 is a low power audio frequency amplifier requiring a low level power supply (most often batteries). It comes in an 8-pin mini-DIP package. The IC is designed to deliver a voltage amplification of 20 without external add-on parts.....
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I need someone to look at this. I designed this H-Bridge to run a 12VDC, 6 Amp motor. It worked great on the breadboard at 7.2 VDC running a small DC....
-
-
If you are a newbie and having the similar experience, here I suggest a general purpose I/O board that will not only reduce your prototyping time but also free up plenty of space on the breadboard for your project. The construction of this board is very....
-
The TEA5764UK is a single chip electronically tuned FM stereo Radio with Radio Data System (RDS) and Radio Broadcast Data System (RBDS) Demodulator and RDS/RBDS decoder for portable application with fully integrated IF selectivity and demodulation. The Radio....
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The main requirements are only a directional antenna (ie a ferrite rod or frame) and a screened case for the works of the set. In the past some competitors have modified ordinary medium wave receivers to cover 160m by retuning the front end. However, most....
-
Catalyst Semiconductor, Inc. (NASDAQ:CATS)a supplier of analog, mixed-signal and non-volatile memory semiconductors, announced it has received a patent for a unique step-down switching regulator circuit architecture applicable to step-down regulators for....
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-
-
full sine wave ups information, in English, with a detailed C language source code, English may be the weak to be careful of, a little..
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-
-
-
This project consists of a small, portable DJ mixer powered by a 9V dc external supply adaptor or from a 9V PP3 battery. The mixer features two stereo phono inputs and two stereo line-level inputs and has one stereo mixing channel. A microphone input and a....
-
Using the principles of a horizontal steam engine I constructed a model in which the steam cylinder is replaced by an electromagnet with a moving core. The construction details of the model are of little importance, as the photos give all the information you....
-
A mute-switch for the Etherwave that adds a "mute status" light which doubles as a power-on light. Here`s the schematic. Don`t forget to browse the rest of Art`s great site!..
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This is a circuit intended to be used in basketball shot clock.Notes:To start in 24 seconds; 24s LOAD SW and Reset SW should be push simultaneously. If not, the count will start in 99. Pulse input can be connected to 555 astable multivibrator but must be....
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This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz. Note, however that this circuit is NOT a metal detector, but will detect metal wiring if it conducting ac....
-
Using LM833 can be designed a very simple tone control circuit using few external components. For this Lm833 ton control circuit can be used almost any type of operational amplifier if it have high input impedance. The LM833 is a is a dual general purpose....
-
A simple multi-channel audio mixer circuit using LM3900 quad amplifier is given below. The circuit consists of 4 channel quad amplifier (LM3900). Two mic audio inputs and two direct line inputs are available in this circuit. By adding the same circuit....
-
Using the LTC3810-5 synchronous step-down switching regulator controller can be designed a very easy and simple 12 volt switching power supply electronic project using few external electronic parts. LTC3810-5 synchronous step-down switching regulator....
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This is a small electronic switch that connects a battery to the equipment for a certain amount of time when a push-button is momentarily pressed. And we have also taken the ambient light level into account; when it is dark you won t be able to read the....
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Function: made for battery charging time of three hours. Once the charging time is up the battery will be disconnected from the charger. Component: 4017 IC, ....
-
Here is the circuit of an ultra sensitive IR receiver that can be used to switch on various AC devices through an IR transmitter. It uses the Photo transis....
-
The LMC568 is an amplitude-linear phase-locked loop consisting of a linear VCO fully balanced phase detectors, and a Carrier detect output. LMCMOS technology is employed for high performance with low power consumption. The VCO has a linearized control range....
-
To measure the frequency response of the e-meter, a Wein Bridge oscillator, oscilloscope, and single-ended power supply were used. (Ironically, a bridge oscillator is being used to measure a bridge detector. ) The oscillator uses a TL074 quad op-amp,....
-
This is the unexpurgated, pre-edited version of the article "Improved Anode-Circuit Parasitic-Suppression For Modern Amplifier-Tubes" that appeared on page 36 in the October 1988 issue of QST. A more recent treatment of the subject appeared in the September....
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Crystal Y1 develops a 14. 31818MHz fundamental frequency clock signal. U31 is a Dual Voltage Controlled Oscillator. The output on pin 10 is a 14. 31818 MHz clock signal called the color clock. R27 can be adjusted to obtain exact output frequency. U30 is a....
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Here is vu meter analog circuit. The circuit is left connected to the line terminals of the amplifier. The VU meter is quite simple. T1 and T2 signal increase..
-
The circuitry of the ZXInterface2 is very simple and is comprised of a single custom made IC which performs address decoding for the twin joystick interface. The ROM cartridge socket simply exposes signals already available from the Spectrum`s edge....
-
-
Infrared light reflected off a finger is used to activate this switch circuit. Drawing only 30uA from a 3v supply, this circuit will detect a human finger with a range of about 1 inch. The sensor uses an inexpensive infrared LED and a matching photo diode...
-
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 main system is the user interface and control system. The phone line was chosen as the method of interfacing because it has distinct advantages over other systems in communicating information from a distance. The next image serves as a block diagram for....
-
-
This is a microphone pre-amp which I designed intended for function with a SoundBlaster(TM) AWE 64 charge sound license; but it be supposed to exist apt for one compatible tag otherwise PC audio input which provides a 5 Volt supply (via a 2k2, or else....
-
The Raspberry Pi provides general purpose digital input/output pins (called GPIO pins) that you can use for reading digital logic signals or for outputting digital logic levels. The outputs do not have much current capability, but you can drive LEDs or....
-
When you press a start button, the arduino picks a random 4 diget code and flashes lights to show the code. When you repeat the code in the other buttons, the XBee will send a message to the other XBee, which will ring the bell. int bell=5; void setup(){....
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A board design that is supposed to measure a loadcell. We have finally tracked a system accuracy fault down to the amp IC. When we twist the board, the amp IC changes its output. I get +80mV when I twist the board from its 4 corners. I`m using the amount of....
-
-
Powering this circuit with a 6v alkaline battery, the circuit works just fine with 100uf capacitors. But the problem is I want to replace the LED with a dpdt relay, I tried a 6v one I had laying around but it wont budge. Also when I tried the circuit with a....
-
The LA3370 is a multiplex IC for FM car stereo, and it has the following 2 functions through its utilization of the IF meter output voltage, etc. 1. Stereo noise control (SNC) under which the noise particular to the FM stereo unit in the weak electric field....
-
An amplifier built to drive my Sennheiser HD-600 headphones. Because of the relatively high impedance of these phones, I wanted plenty of voltage available to drive them. Because of the large dynamic range possible with these phones the system had to be very....
-
Let`s construct a low-power FM transmitter using surface-mount devices (SMD) that will be received with a standard FM radio. Soldering surface mounted devi....
-
-
-
-
-
This circuit features automatic Exit and Entry delays and a timed Bell Cut-off. It has provision for both normally-closed and normally-open contacts, and a 24-hour Personal Attack/Tamper zone. By using the Expansion Modules, you can add as many zones as you....
-
The TX audio cable can be a little more complicated then the RX audio cable. Normally, the TX audio cable must have a circuit to attenuate the voltage leaving the sound card`s LINE OUT jack, otherwise the radio`s transmit circuit will be overdriven. Note:....
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A circuit that will block my TV and any device I choose from getting a signal from the normal remote control. I turn an ordinary remote into a jammer and the remote still works normally! Watch the video to see it work. I chose to use a Sony remote control....
-
Combine an inexpensive transceiver, some free software and you`re on PSK31 at a rock-bottom price! Add to that the fun and pride of building the transceiver and you`ve got a n irresistible package! I is a relatively new I digital mode, created Iby Peter....
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This is The Fet Amplifier circuit. This circuit uses FET transistor. The gate of the FET must be negative with respect to the source, so a bias can be achieved in the following manner. The voltage that is across the source resistor is developed by the drain....
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The image below shows a Block diagram of the entire mixer that includes four Input Amplifier Modules followed by four in-out switchable Tone management Modules, one stereo Line input, four mono Main Faders, one stereo dual-ganged Main Fader, four Pan-Pots, a....
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-
In many projects use is made of alphanumeric LCDs that are driven internally by Hitachi s industry-standard HD44780 controller. These displays can be driv....
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This USB car charger adapter project is a DC DC power converter that safely converts the 12V car battery voltage into stable 5V. This USB car charger circuit can be used to supply power from a car cigar lighter socket to a portable device that require a 5....
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-
This is a 220V Touch Switch circuit. This circuit is used as switch which turn off and turn on the the electronic device that is connected to the 220V home....
-
As space is at a premium here, I`m using a small 6V battery and dropping the voltage down by 1.2V to 4.8V with the diodes D1 and D2. The PicAxe chip....
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The circuit given below is of a telephone operated DTMF remote. The circuit can be used to switch up to 9 devices using the keys 0 to 9 of the telephone. Digit 0 is used to switch the telephone system between remote switching mode and normal conversation....
-
hi Im trying to construct a Hartley Oscillator. I am using a bypassed common emiter and i am trying to get a 200kHz 2Vp-p oscilation. With a BC547B....
-
-
Audio processors are usually used in paging systems, in wireless intercom and the likes to amplify the microphone signal to a certain level. This can be done by using either a compressor or a limiter circuit. Although a compressor has lower distortion....
-
-
This is a simple LED torch circuit based on IC MAX660 from MAXIM semiconductors. The MAX 660 is a CMOS type monolithic type voltage converter IC. The IC can easily drive three extra bright white LEDs. The LEDs are connected in parallel to the output pin 8 of....
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This circuit be Simple Metronome circuit model to be simple. It use the transistor be important equipment by very the circuit is the character Astable Multi vibrator. For produce something the sound beep. By can fine VR1 for get sound tone Generator follow....
-
Traditional UPS adopts the circuit control of simulation, as to manufacturer and user, no matter accuse of technology or SPWM technology, there is a great deal of limitation in analog control. With the development of information technology, high-speed....
-
-
R2 controls how fast C1 charges, and I know that at a certain point C1 will trigger Q1 and Q2 to release the 9 volts (see 2). This 9 volt burst creates the clicking sound. How does the capacitor discharge I imagine that the capacitor will slowly charge up to....
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You may be wondering why I am using four tubes. The reason is to get 50 watts without pushing them right to their limit. My tube manual gives two setups for EL34s in ultra linear. Both require a 6 k ohm transformer. Both setups use exactly the same voltages....
-
The SA605 is a high performance monolithic low-power FM IF system incorporating a mixer Oscillator two limiting intermediate frequency Amplifiers quadrature detector, muting, logarithmic received signal strength indicator (RSSI), and voltage Regulator The....
-
Class D audio power amplifier schematic diagram with TDA7480, capable of 10W output power at a load of 8w/4w and a total harmonic distorsion of 10%. Requires a split-supply (max. ±20V)....
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This is a low cost way of measuring temperature and humidity with a computer interface and is intended to be an entry level project for high school students on a tight budget. ..
-
The given circuit of a current controlled LED tube light uses a couple of high voltage transistors which works on a very basic principle for implementing the required current control operation. Resistor R2 is placed forconvertingthe rising current to voltage....
-
The technology of data acquisition is the important branch of information science, it not merely employs in intelligent instrument, and in modern industrial production, military science is used widely, no matter proceeding control, condition monitoring, or....
-
-
When one of the normally-open switches is closed - two things happen. Firstly - the negative side of the relay coil is connected to ground through D1. This causes the relay to energize. And the relay in turn sounds the siren. = Secondly - the emitter-base....
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Most of the LCD issues are due to Delay routines only. First try to interface LCD properly then try for your digital clock. Step by step approach is important. You may refer to LCD tutorial which is in tutorial section. code is ok i check it on Proteus it is....
-
The NI 655X is a versatile high-speed digital product that can interface to many different technologies. This application note shows how to interface the NI 655X to LVDS devices. Low Voltage Differential Signaling (LVDS) is an emerging differential digital....
-
What I would do is switch the headlight switch ON & OFF and them see if you can "feel & hear" the headlight relay clicking. This is shown in the first schematic, on the left of the diagram. The triangle at the bottom left leads to the two 15 amp fuses you....
-
Using the MAX8844 lithium ion charger IC released by Maxim Semiconductors you can design an very simple and efficiency charger circuit for charging a single cell lithium-ion battery. The MAX8844 lithium ion charger integrate a current-sense circuit, MOSFET....
-
This signal generator is intended for realignment of radio receivers. The unit is cheap and fairly basic, but perfectly adequate for its intended purpose. However, the output is not a pure sine wave, so the unit may not be suited for more exacting electronic....
-
Before attempting to build the control circuit, it is recommended that the function of each part the circuit is understood. The schematic below shows the basic functions only. CRS Controller board: The key synchronization signal or Scan Line Clock (SLC) for....
-
LTM8042 combines a boost power topology with a unique current loop to operate as a constant-current source. The PWM input provides as much as 3000:1 LED dimming, while 10:1 analog dimming can be accomplished by a single resistor or analog voltage applied to....
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Quadrature oscillator is another type of phase shift oscillator. This circuit produce two sine wave signal. One of them is shifted 90 degree from the other....
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This design combines power-on and low-battery indication, can operate with any battery voltage up to 15V, has very low current drain (2mA or less) and costs less than $3. 50 with new parts. When the battery voltage is above a predetermined minimum, power on....
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Logic power control of analog regulator can be useful in application where a digital circuit/controller need to control power source, such as in EEPROM...
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There is now no need for a separate camera and recorder - for less money you can buy an integrated dash camera that will record in HD. Try the Techmoan blog for some reviews. Summary - this is a description of how to install a fairly cheap video recording....
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Here I will show you an audio amplifier circuit that can be used for walkie talkies, low power transmitters, and packet radio receivers. A condenser mic audio amplifier gives good quality audio of 0. 5 watts at 3 volts. Here we are going to make use of BEL....
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Many versions of VCXO`s this is the final version I have decide to use in all VCXO`s in the Future, it is extremely universal at all Freq. up to 7th Ovetone XTAL`s that can be used in VCXO. NOTE: On this CPLD PLL Board I am using a second Phase Lock....
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This Simple Metal Detector Circuit Diagram Design is based on superheterodyning principle which is commonly used in superhet receivers. The circuit utilizes two RF In the circuits diagram, IC1- io the 555 Ic, whose frequercy is determined by f1= 0. 7R/L1....
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The following diagram is the schematic diagram of 4 transistors FM transmitter circuit designed by Paul K. Sherby. Components List: R1, R2, R8 = 1K R3 = 100K R4 = 150K R5, R7 = 10K R6 = 220 ohm R9 = 10 ohm P1 = 5K trimpot D1 = 1N4002 Q1, Q2 = 2N3904 Q3, Q4 =....
As electrolytic capacitors age, their internal resistance, also known as "equivalent series resistance" (ESR), gradually increases. This can eventually lead to equipment failure. Using this design, you can measure the ESR of suspect capacitors as well as....
Low-drain circuit operating from 1. 5-V cell uses National LM3909 flasher IC to simulate fire-alarm siren. Pressing button produces rapidly rising wail, with tone coasting down in frequency after button is released. Sound from loudspeaker resembles that of....
The integrated chip LM386 is a low power audio frequency amplifier requiring a low level power supply (most often batteries). It comes in an 8-pin mini-DIP package. The IC is designed to deliver a voltage amplification of 20 without external add-on parts.....
I need someone to look at this. I designed this H-Bridge to run a 12VDC, 6 Amp motor. It worked great on the breadboard at 7.2 VDC running a small DC....
If you are a newbie and having the similar experience, here I suggest a general purpose I/O board that will not only reduce your prototyping time but also free up plenty of space on the breadboard for your project. The construction of this board is very....
The TEA5764UK is a single chip electronically tuned FM stereo Radio with Radio Data System (RDS) and Radio Broadcast Data System (RBDS) Demodulator and RDS/RBDS decoder for portable application with fully integrated IF selectivity and demodulation. The Radio....
The main requirements are only a directional antenna (ie a ferrite rod or frame) and a screened case for the works of the set. In the past some competitors have modified ordinary medium wave receivers to cover 160m by retuning the front end. However, most....
Catalyst Semiconductor, Inc. (NASDAQ:CATS)a supplier of analog, mixed-signal and non-volatile memory semiconductors, announced it has received a patent for a unique step-down switching regulator circuit architecture applicable to step-down regulators for....
full sine wave ups information, in English, with a detailed C language source code, English may be the weak to be careful of, a little..
This project consists of a small, portable DJ mixer powered by a 9V dc external supply adaptor or from a 9V PP3 battery. The mixer features two stereo phono inputs and two stereo line-level inputs and has one stereo mixing channel. A microphone input and a....
Using the principles of a horizontal steam engine I constructed a model in which the steam cylinder is replaced by an electromagnet with a moving core. The construction details of the model are of little importance, as the photos give all the information you....
A mute-switch for the Etherwave that adds a "mute status" light which doubles as a power-on light. Here`s the schematic. Don`t forget to browse the rest of Art`s great site!..
This is a circuit intended to be used in basketball shot clock.Notes:To start in 24 seconds; 24s LOAD SW and Reset SW should be push simultaneously. If not, the count will start in 99. Pulse input can be connected to 555 astable multivibrator but must be....
This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz. Note, however that this circuit is NOT a metal detector, but will detect metal wiring if it conducting ac....
Using LM833 can be designed a very simple tone control circuit using few external components. For this Lm833 ton control circuit can be used almost any type of operational amplifier if it have high input impedance. The LM833 is a is a dual general purpose....
A simple multi-channel audio mixer circuit using LM3900 quad amplifier is given below. The circuit consists of 4 channel quad amplifier (LM3900). Two mic audio inputs and two direct line inputs are available in this circuit. By adding the same circuit....
Using the LTC3810-5 synchronous step-down switching regulator controller can be designed a very easy and simple 12 volt switching power supply electronic project using few external electronic parts. LTC3810-5 synchronous step-down switching regulator....
This is a small electronic switch that connects a battery to the equipment for a certain amount of time when a push-button is momentarily pressed. And we have also taken the ambient light level into account; when it is dark you won t be able to read the....
Function: made for battery charging time of three hours. Once the charging time is up the battery will be disconnected from the charger. Component: 4017 IC, ....
Here is the circuit of an ultra sensitive IR receiver that can be used to switch on various AC devices through an IR transmitter. It uses the Photo transis....
The LMC568 is an amplitude-linear phase-locked loop consisting of a linear VCO fully balanced phase detectors, and a Carrier detect output. LMCMOS technology is employed for high performance with low power consumption. The VCO has a linearized control range....
To measure the frequency response of the e-meter, a Wein Bridge oscillator, oscilloscope, and single-ended power supply were used. (Ironically, a bridge oscillator is being used to measure a bridge detector. ) The oscillator uses a TL074 quad op-amp,....
This is the unexpurgated, pre-edited version of the article "Improved Anode-Circuit Parasitic-Suppression For Modern Amplifier-Tubes" that appeared on page 36 in the October 1988 issue of QST. A more recent treatment of the subject appeared in the September....
Crystal Y1 develops a 14. 31818MHz fundamental frequency clock signal. U31 is a Dual Voltage Controlled Oscillator. The output on pin 10 is a 14. 31818 MHz clock signal called the color clock. R27 can be adjusted to obtain exact output frequency. U30 is a....
Here is vu meter analog circuit. The circuit is left connected to the line terminals of the amplifier. The VU meter is quite simple. T1 and T2 signal increase..
The circuitry of the ZXInterface2 is very simple and is comprised of a single custom made IC which performs address decoding for the twin joystick interface. The ROM cartridge socket simply exposes signals already available from the Spectrum`s edge....
Infrared light reflected off a finger is used to activate this switch circuit. Drawing only 30uA from a 3v supply, this circuit will detect a human finger with a range of about 1 inch. The sensor uses an inexpensive infrared LED and a matching photo diode...
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 main system is the user interface and control system. The phone line was chosen as the method of interfacing because it has distinct advantages over other systems in communicating information from a distance. The next image serves as a block diagram for....
This is a microphone pre-amp which I designed intended for function with a SoundBlaster(TM) AWE 64 charge sound license; but it be supposed to exist apt for one compatible tag otherwise PC audio input which provides a 5 Volt supply (via a 2k2, or else....
The Raspberry Pi provides general purpose digital input/output pins (called GPIO pins) that you can use for reading digital logic signals or for outputting digital logic levels. The outputs do not have much current capability, but you can drive LEDs or....
When you press a start button, the arduino picks a random 4 diget code and flashes lights to show the code. When you repeat the code in the other buttons, the XBee will send a message to the other XBee, which will ring the bell. int bell=5; void setup(){....
A board design that is supposed to measure a loadcell. We have finally tracked a system accuracy fault down to the amp IC. When we twist the board, the amp IC changes its output. I get +80mV when I twist the board from its 4 corners. I`m using the amount of....
Powering this circuit with a 6v alkaline battery, the circuit works just fine with 100uf capacitors. But the problem is I want to replace the LED with a dpdt relay, I tried a 6v one I had laying around but it wont budge. Also when I tried the circuit with a....
The LA3370 is a multiplex IC for FM car stereo, and it has the following 2 functions through its utilization of the IF meter output voltage, etc. 1. Stereo noise control (SNC) under which the noise particular to the FM stereo unit in the weak electric field....
An amplifier built to drive my Sennheiser HD-600 headphones. Because of the relatively high impedance of these phones, I wanted plenty of voltage available to drive them. Because of the large dynamic range possible with these phones the system had to be very....
Let`s construct a low-power FM transmitter using surface-mount devices (SMD) that will be received with a standard FM radio. Soldering surface mounted devi....
This circuit features automatic Exit and Entry delays and a timed Bell Cut-off. It has provision for both normally-closed and normally-open contacts, and a 24-hour Personal Attack/Tamper zone. By using the Expansion Modules, you can add as many zones as you....
The TX audio cable can be a little more complicated then the RX audio cable. Normally, the TX audio cable must have a circuit to attenuate the voltage leaving the sound card`s LINE OUT jack, otherwise the radio`s transmit circuit will be overdriven. Note:....
A circuit that will block my TV and any device I choose from getting a signal from the normal remote control. I turn an ordinary remote into a jammer and the remote still works normally! Watch the video to see it work. I chose to use a Sony remote control....
Combine an inexpensive transceiver, some free software and you`re on PSK31 at a rock-bottom price! Add to that the fun and pride of building the transceiver and you`ve got a n irresistible package! I is a relatively new I digital mode, created Iby Peter....
This is The Fet Amplifier circuit. This circuit uses FET transistor. The gate of the FET must be negative with respect to the source, so a bias can be achieved in the following manner. The voltage that is across the source resistor is developed by the drain....
The image below shows a Block diagram of the entire mixer that includes four Input Amplifier Modules followed by four in-out switchable Tone management Modules, one stereo Line input, four mono Main Faders, one stereo dual-ganged Main Fader, four Pan-Pots, a....
In many projects use is made of alphanumeric LCDs that are driven internally by Hitachi s industry-standard HD44780 controller. These displays can be driv....
This USB car charger adapter project is a DC DC power converter that safely converts the 12V car battery voltage into stable 5V. This USB car charger circuit can be used to supply power from a car cigar lighter socket to a portable device that require a 5....
This is a 220V Touch Switch circuit. This circuit is used as switch which turn off and turn on the the electronic device that is connected to the 220V home....
As space is at a premium here, I`m using a small 6V battery and dropping the voltage down by 1.2V to 4.8V with the diodes D1 and D2. The PicAxe chip....
The circuit given below is of a telephone operated DTMF remote. The circuit can be used to switch up to 9 devices using the keys 0 to 9 of the telephone. Digit 0 is used to switch the telephone system between remote switching mode and normal conversation....
hi Im trying to construct a Hartley Oscillator. I am using a bypassed common emiter and i am trying to get a 200kHz 2Vp-p oscilation. With a BC547B....
Audio processors are usually used in paging systems, in wireless intercom and the likes to amplify the microphone signal to a certain level. This can be done by using either a compressor or a limiter circuit. Although a compressor has lower distortion....
This is a simple LED torch circuit based on IC MAX660 from MAXIM semiconductors. The MAX 660 is a CMOS type monolithic type voltage converter IC. The IC can easily drive three extra bright white LEDs. The LEDs are connected in parallel to the output pin 8 of....
This circuit be Simple Metronome circuit model to be simple. It use the transistor be important equipment by very the circuit is the character Astable Multi vibrator. For produce something the sound beep. By can fine VR1 for get sound tone Generator follow....
Traditional UPS adopts the circuit control of simulation, as to manufacturer and user, no matter accuse of technology or SPWM technology, there is a great deal of limitation in analog control. With the development of information technology, high-speed....
R2 controls how fast C1 charges, and I know that at a certain point C1 will trigger Q1 and Q2 to release the 9 volts (see 2). This 9 volt burst creates the clicking sound. How does the capacitor discharge I imagine that the capacitor will slowly charge up to....
You may be wondering why I am using four tubes. The reason is to get 50 watts without pushing them right to their limit. My tube manual gives two setups for EL34s in ultra linear. Both require a 6 k ohm transformer. Both setups use exactly the same voltages....
The SA605 is a high performance monolithic low-power FM IF system incorporating a mixer Oscillator two limiting intermediate frequency Amplifiers quadrature detector, muting, logarithmic received signal strength indicator (RSSI), and voltage Regulator The....
Class D audio power amplifier schematic diagram with TDA7480, capable of 10W output power at a load of 8w/4w and a total harmonic distorsion of 10%. Requires a split-supply (max. ±20V)....
This is a low cost way of measuring temperature and humidity with a computer interface and is intended to be an entry level project for high school students on a tight budget. ..
The given circuit of a current controlled LED tube light uses a couple of high voltage transistors which works on a very basic principle for implementing the required current control operation. Resistor R2 is placed forconvertingthe rising current to voltage....
The technology of data acquisition is the important branch of information science, it not merely employs in intelligent instrument, and in modern industrial production, military science is used widely, no matter proceeding control, condition monitoring, or....
When one of the normally-open switches is closed - two things happen. Firstly - the negative side of the relay coil is connected to ground through D1. This causes the relay to energize. And the relay in turn sounds the siren. = Secondly - the emitter-base....
Most of the LCD issues are due to Delay routines only. First try to interface LCD properly then try for your digital clock. Step by step approach is important. You may refer to LCD tutorial which is in tutorial section. code is ok i check it on Proteus it is....
The NI 655X is a versatile high-speed digital product that can interface to many different technologies. This application note shows how to interface the NI 655X to LVDS devices. Low Voltage Differential Signaling (LVDS) is an emerging differential digital....
What I would do is switch the headlight switch ON & OFF and them see if you can "feel & hear" the headlight relay clicking. This is shown in the first schematic, on the left of the diagram. The triangle at the bottom left leads to the two 15 amp fuses you....
Using the MAX8844 lithium ion charger IC released by Maxim Semiconductors you can design an very simple and efficiency charger circuit for charging a single cell lithium-ion battery. The MAX8844 lithium ion charger integrate a current-sense circuit, MOSFET....
This signal generator is intended for realignment of radio receivers. The unit is cheap and fairly basic, but perfectly adequate for its intended purpose. However, the output is not a pure sine wave, so the unit may not be suited for more exacting electronic....
Before attempting to build the control circuit, it is recommended that the function of each part the circuit is understood. The schematic below shows the basic functions only. CRS Controller board: The key synchronization signal or Scan Line Clock (SLC) for....
LTM8042 combines a boost power topology with a unique current loop to operate as a constant-current source. The PWM input provides as much as 3000:1 LED dimming, while 10:1 analog dimming can be accomplished by a single resistor or analog voltage applied to....
Quadrature oscillator is another type of phase shift oscillator. This circuit produce two sine wave signal. One of them is shifted 90 degree from the other....
This design combines power-on and low-battery indication, can operate with any battery voltage up to 15V, has very low current drain (2mA or less) and costs less than $3. 50 with new parts. When the battery voltage is above a predetermined minimum, power on....
Logic power control of analog regulator can be useful in application where a digital circuit/controller need to control power source, such as in EEPROM...
There is now no need for a separate camera and recorder - for less money you can buy an integrated dash camera that will record in HD. Try the Techmoan blog for some reviews. Summary - this is a description of how to install a fairly cheap video recording....
Here I will show you an audio amplifier circuit that can be used for walkie talkies, low power transmitters, and packet radio receivers. A condenser mic audio amplifier gives good quality audio of 0. 5 watts at 3 volts. Here we are going to make use of BEL....
Many versions of VCXO`s this is the final version I have decide to use in all VCXO`s in the Future, it is extremely universal at all Freq. up to 7th Ovetone XTAL`s that can be used in VCXO. NOTE: On this CPLD PLL Board I am using a second Phase Lock....
This Simple Metal Detector Circuit Diagram Design is based on superheterodyning principle which is commonly used in superhet receivers. The circuit utilizes two RF In the circuits diagram, IC1- io the 555 Ic, whose frequercy is determined by f1= 0. 7R/L1....
The following diagram is the schematic diagram of 4 transistors FM transmitter circuit designed by Paul K. Sherby. Components List: R1, R2, R8 = 1K R3 = 100K R4 = 150K R5, R7 = 10K R6 = 220 ohm R9 = 10 ohm P1 = 5K trimpot D1 = 1N4002 Q1, Q2 = 2N3904 Q3, Q4 =....
![LED Flasher Circuit [PIC]](uploads/55/circuit-diagram.gif "LED Flasher Circuit [PIC]")
