New Circuits Page 33
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This circuit is a circuit diagram of ECM Mic Preamplifier. A microphone amplifier that can be used with either Electret Condenser Microphone (ECM). Preamplifier has a dynamic range very well and can handle anything from a whisper to a scream, but must be....
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When you need an amplifier with high watt power. For use in applications such as concert, theater, the festivals etc. This circuit is most suitable. Both....
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This stereo FM stereo modulator circuit use the BH1417F FM stereo transmitter IC which consists of a stereo modulator for generating stereo composite signals and a FM transmitter for broadcasting a FM signal on the air. The stereo modulator generates a....
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This low-cost short-wave transmitter is tunable from 10 to 15 MHz with the help of ½J gang condenser VC1, which determines the carrier frequency of the transmitter in conjunction with inductor L1. The frequency trimming can be done with VC2. The carrier is....
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A single IC provides all amplifiers: 74HC04 Hex Inverter ( a digital element). The 2nd oscillator synchronizes to 3 times the 1st oscillator and thereforethe FM deviation is tripled. Using the lower freq f1 oscillator also enhancesfrequency stability. ..
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This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles....
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This is versatile digital counter circuit, that as a cheap due to basic components you can buy in many electronic shop. My friend said the some circuits that....
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This circuit is basically repeated for each of the 3 motor phases. Here is my experience with repairing the motor control board in this washer. The Q5 mosfet blew out on c phase of the motor drive circuit and the 75 ohm resistor labeled J12 driving this....
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This is a project from the dim and distant past that has proven to be a real winner. I have used it as a basis for an 8 channel proportional R / C (AM) and 145MHz FM chat box. Recipients very simple and is shown below. This consists of a single transistor....
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Most homes today have at least a few infrared remote controls, whether they be for the television, the video recorder, the stereo, etc. Despite that fact, who among us has not cursed the light that remained lit after we just sat down in a comfortable chair....
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The amplifier in the following schematic, when simulated, shows that it can cleanly amplify a signal with 0. 1V amplitude to 10V. When driven with a larger signal, though, the behavior is very nasty in the positive half cycle. The output suddenly dives from....
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An DIY RF decibel (or power) meter is an indispensable instrument in any radio workshop. Unfortunately, accurate, wideband models are fairly expensive, and....
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R2 will have to be adjusted to set the proper finish charge voltage. Flooded and gel batteries are generally charged to 13. 8V. If you are cycling the battery (AGM or gel) then 14. 5V to 14. 9V is generally recommended by battery manufacturers. To set up the....
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The +5V, 1.6A precision switching power supply circuit is as shown in the figure. This circuit increases the photoelectric coupler (CNY75A) and the adjustable precision parallel regulator (TIA31). R3 is the current limiting resistor, R4 and R5 are the....
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The following circuit shows about UHF Indicator Wavemeter Circuit Diagram. This circuit using dual BF494 Transistor. Features: oscillator is ....
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This circuit can be used to measure the voltage to 15 volts.Using the current from the battery 9 volt,At 23 mA only. Input circuit has a diode, to protect the....
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This simple circuit can be used as an aid for sensing the distance between the rear bumper of the car and any obstacle behind the car. The distance can be understood from the combination of the LEDs (D5 to D7) glowing. At 25cm D7 will glow, at 20 cm D7&D6....
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-
This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen. It was used as part of a firearm training system. It generates a 100mS output pulse whenever it detects a 3ms to 5ms-laser burst,....
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-
This circuit generates the sound of the electronic ringer found in modern telephones, supplanting the 2-bell electromechanical ringers used previously. The ringing pattern follows the United States convention of 2 seconds on, and 4 seconds off. During the....
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A bright lamp flashes in sychrony with the lightning bolts indicating the proximity and intensity of the storm....
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IC LM2917 IC chip is designed specifically as a Frequency to Voltage Converter or Frequency to Voltage converter. In its use to applications Frequency to Voltage Converter IC LM2917 requires few external components. There are several examples of applications....
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A robot that dances to music. G‚ Wouldn`t it be wicked cool to have a cute little robot on your desk dancing to Fatboy Slim Winamp provides a nice API for writing music visualization plug-ins. G‚ I wrote a plug-in that sends signals to the parallelport that....
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A amplifier of force RF for the FM, is always essential for the amateur that wants it strengthens some small transmitter, that likely already it has manufactured or has been supplied ready. The present circuit can give 50-60W RF force of expense, with....
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The design of solar panel systems with a (lead-acid) buffer battery is normally such that the battery is charged even when there is not much sunshine. This means, however, that when there is plenty of sunshine, a regulator is needed to prevent the battery....
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The following is a translation of a section from the first book of the 3 part series "Die RG¶hre im UKW EmpfG¤ng" edited by Dr. Ing. Horst Rothe in 1952. This very interesting section describes a fully differential super-regenerative self-limiting FM....
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This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared....
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How does one measure small inductances with a precision of at least two, and possibly three, significant digits A search of the literature produced scanty results. One interesting circuit was described in The 2001 ARRL Handbook on p 26. 22. I built a....
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Magic Sinewave Analysis using SPICE and a Simple Inverter Circuit...
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The following circuit shows about Curtain Control Circuit Diagram. This circuit based on the 555 IC. Features: Switch for manual control, IC and a ....
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Software, Applications and Programming Resources. Amateur Radio and Travel. Stereogram Art....
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Running the Simple MT 8870 Decoder from your Cell Phone the devise can be operated from any type of DTMF tones like Land Lines, Mobiles, Computers, Radio Transmitters that send DTMF tones over the air waves, Ham Radio sets with DTMF built in to them it has a....
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This circuit, a simple mixer circuit. It can mix two signal channels and one channel is output. Using a codec circuit, Convert stereo audio to mono audio time. It can increase the number of channels too. By adding a VR1, R1 and C1 to the amount needed. Then....
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Firstly, it demonstrates how the combination of a blue and a white LED can be used to give a realistic imitation of a camera flashlight. Secondly, the goo....
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This circuit uses an oscillator (2N2222) and a diode Dl as a nonlinear mixer. The frequency is set by a slug in Ll. RFCl, Cl, and RFC2 form a low-pass filter to pass video and block rffrom the video source..
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It`s a power amplifier configuration that was developed in the 1950s. It is called a circlotron because the original idea diagram was drawn as a circle. The best I can do with my graphics program is to show it as a bridge. It`s promise is very low....
-
-
Are you a beginner in micro controller projects and are you stuck where to start from if yes, then this is one of the simplest mini projects that you can start from. This mini project will give you a clear understanding of programming your micro controller.....
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Calculated the output of the transformer to be 125 times (1000 / 8) higher than input. Since 12v is given as input, output should be 1500v (not sure about this)..
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This sunlight-controlled lamp uses a light-dependent resistor (LDR) as the sunlight sensor and a total of 25 high-brightness white LEDs. Separate resistors are connected in series with each row of the LEDs. The working of the circuit is very simple. During....
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Locker Guard Circuit Diagram. This tiny circuit can protect your Locker or Almirah from a burglary. If the locker opens in the armed state, the circuit generates a loud police siren to thwart the attempt of burglary ..
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This 4 1/2-digit DVM circuit is built around a Maxim ICL7129ACPL A/D converter and LCD driver. An ICL8069 CCZR 1. 2-V band-gap reference diode is used for a voltage reference. S2a-b-c select one of four ranges up to 200 V (maximum). The meter also has a....
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I don`t the right place to post this but I`ll try my luck here: I`m looking to build a timer for a pump. I want the pump to run for 5 minutes, then....
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As already explained, a monostable multivibrator (MMV) has one stable state and one quasi-stable state. The circuit remains in its stable state till an external triggering pulse causes a transition to the quasi-stable state. The circuit comes back to its....
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The following circuit shows about Car Door Keypad Electronic Circuit Diagram. Features: lower pin-count lower cost device, uses an MC68HC908AZ60A, ....
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The following circuit shows about Automatic Room Power Control Circuit Diagram. This circuit based on the NE555 IC. Features: uses two LDRs, use ....
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For a project I need to display a progress bar of the activity performed by my MCU. For this purpose I am going to use a bargraph display, but the problem is that bargraph display driver driver IC LM3914 uses analog input where as MCU produces a digital....
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A light/dark sensing circuit is extremely useful and versatile in a wide range of renewable energy projects from automatic lighting to security systems. In our article Light Dependent Resistor we explained how an LDR can be used in simple circuits to control....
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Many RC oscillators use advanced circuit in phase shift unit. It uses a voltage feedback amplifier, of which the gain will get a sharp decline in a higher frequency and stop oscillation before reaching the desired frequency. That is the reason why voltage....
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This is a simple application of internal 10-bit ADC(analogto digital converter) of PIC16F676 microcontroller. you can use this circuit to measure up to 30 v dc. the possible applications are on bench top power supply or as a panel meter invarioussystem.....
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The above diagram shows the different links to theinputs and outputs of each operational-amplifier from the power source and how each operation amplifier is wired to operate each seperate light emitting diode. Also shows calculations to obtaining each....
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This is an early test program (assembly source code), which was stored on the erasable programmable memory chip (EEPROM). Assembler programming is just 1 step above programming at the binary level...
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Electronics motor control is a simple circuit made without IC.electronics control of AC motor.circuit diagram with description of electronics motor controller...
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Ok. So I`ve bought and sold 10 MK3 Jettas and 1 MK3 Golf. Never posted on a forum before. I paid $400 for a 1994 GTI, in order to fix it and sell it, so theres that. The car ran 2 years ago, when my friend was driving it home from 2.5 hours away, it died on....
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found the current in both the loops using Kirchhoff`s Voltage law but then I`m confused on the proper method to find the potential drop between the two loops. I suggest you insert two extra points A and B on both ends of the battery (on the bottom right of....
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This circuit is a Mosfet-based linear voltage regulator with a voltage drop of as low as 60mV at 1A. The circuit uses a 15V-0-15V transformer and employs an IRF540 N-channel Mosfet (Q1) to deliver the regulated 12V output. The gate drive voltage required for....
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This Adjustable Voltage Regulator is made by combining a common 78L05 with an integrated audio amplifier of the type TDA2030, an adjustable voltage regulat....
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The world is going nuts over the Raspberry Pi single-board computer (SBC) for being a whole system under $50. In reality though the Pi isn`t actually the cheapest computing device available. If you want really cheap how does $13. 50 sound for a mini computer....
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rfRXD0920 The RFRXD0420 RFRXD0920 are low cost, compact single frequency short-range Radio receivers requiring only a minimum number of external components for a complete receiver system. The RFRXD0420 covers the receive frequency range of 300 MHz to 450 MHz....
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The SM5021 series are crystal Oscillator module ICs fabricated in NPCs Molybdenum-gate CMOS, that incorporate high-frequency, low current consumption Oscillator and output Buffer circuits. Highly accurate thin-lm feedback resistors and high-frequency....
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The original data sheet for the MK414 states a maximum working frequency is around 4 MHz. SW transmissions are so powerful that this receiver will work well with signals up to about 6 or 7 MHz. The 10k resistor controls the operating voltage for the IC which....
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A low power fm pirate radio. The output power is around +35 dBm ( 3. 16 watts) over 50 ohms load and +24 volts power supply. The project consists in a hartley oscillator ( modulated VCO), and tree stages ( Class A, common emitter) of RF amplifiers. The first....
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Nowadays, a switch-off delay for the vehicle interior lighting is a naturally a standard feature. However, with certain models having only spartanttings, or older-model vehicles, you`re left sitting in the dark as soon as you climb in and close the door.....
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-
Power demand in portable designs CAN require in some specific application more than 1 A. A method consists in paralleling two DC to DC converters on the same load instead of placing a single higher current converter with lower switching frequency. This....
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Many of my friends asked me for automatic on off led circuit or led flashing circuit so here I`m going to post a Astable multivibrator-2 LED flashing circuit. It is a simple astable multivibrator circuit using 2LED (here i used red LED), two NPN small....
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The circuit given here is of a very useful and accurate digital voltmeter with LED display using the ICL7107 from Intersil. The ICL7107 is a high performance, low power, 3. 5 digit analog to digital converter. The IC includes internal circuitry for seven....
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This simple low voltage tester circuit can be used to monitor battery and other voltage sources of current for problems, by LED display and alarm sound. Which....
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This article offers an alternative to efficiency measurements as an evaluation tool of power supplies. The proposed method works well with little dependency on the output voltage and temperature. Power supplies have always been evaluated and compared based....
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This Basic MOSFET amplifier is very simple to build and low cost. Is perfect for Hi-Fi amplifiers and instrument amplifiers (guitar, keyboards ). Output power is + / 100 Wrms at 8 ohm load or + / 160 Wrms below 4 ohms. The simplicity of this circuit cause....
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Developing a transmitter small enough to be implanted in the body of a rat, fast enough to transmit four hundred sixteen-bit data samples per second, powerful enough to be detected at a range of three meters, and efficient enough to operate for three months....
-
-
The circuit shown here should have a lot of applications. Basically, the distribution amplifier takes the composite video signal from a video player (VCR) or a video generator (analogue output) and buffers it in such a way that it can be simultaneously....
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As you can see, the audio ground completely isolated from digital ground. And I`m using top copper layer as a shield for both, audio and digital ground. This helps to isolate audio part from picking up noise from digital circuitry and other EMI. Relay....
-
Circuit schematic above is one of the voltage inverter circuit, starting from 6-Volt input on the DC current into 220-volt AC output. For maximum output power up to 30W only, and is also very small voltage current. Input voltage plus the entrance on the....
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This circuit is a circuit diagram of ECM Mic Preamplifier. A microphone amplifier that can be used with either Electret Condenser Microphone (ECM). Preamplifier has a dynamic range very well and can handle anything from a whisper to a scream, but must be....
When you need an amplifier with high watt power. For use in applications such as concert, theater, the festivals etc. This circuit is most suitable. Both....
This stereo FM stereo modulator circuit use the BH1417F FM stereo transmitter IC which consists of a stereo modulator for generating stereo composite signals and a FM transmitter for broadcasting a FM signal on the air. The stereo modulator generates a....
This low-cost short-wave transmitter is tunable from 10 to 15 MHz with the help of ½J gang condenser VC1, which determines the carrier frequency of the transmitter in conjunction with inductor L1. The frequency trimming can be done with VC2. The carrier is....
A single IC provides all amplifiers: 74HC04 Hex Inverter ( a digital element). The 2nd oscillator synchronizes to 3 times the 1st oscillator and thereforethe FM deviation is tripled. Using the lower freq f1 oscillator also enhancesfrequency stability. ..
This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles....
This is versatile digital counter circuit, that as a cheap due to basic components you can buy in many electronic shop. My friend said the some circuits that....
This circuit is basically repeated for each of the 3 motor phases. Here is my experience with repairing the motor control board in this washer. The Q5 mosfet blew out on c phase of the motor drive circuit and the 75 ohm resistor labeled J12 driving this....
This is a project from the dim and distant past that has proven to be a real winner. I have used it as a basis for an 8 channel proportional R / C (AM) and 145MHz FM chat box. Recipients very simple and is shown below. This consists of a single transistor....
Most homes today have at least a few infrared remote controls, whether they be for the television, the video recorder, the stereo, etc. Despite that fact, who among us has not cursed the light that remained lit after we just sat down in a comfortable chair....
The amplifier in the following schematic, when simulated, shows that it can cleanly amplify a signal with 0. 1V amplitude to 10V. When driven with a larger signal, though, the behavior is very nasty in the positive half cycle. The output suddenly dives from....
An DIY RF decibel (or power) meter is an indispensable instrument in any radio workshop. Unfortunately, accurate, wideband models are fairly expensive, and....
R2 will have to be adjusted to set the proper finish charge voltage. Flooded and gel batteries are generally charged to 13. 8V. If you are cycling the battery (AGM or gel) then 14. 5V to 14. 9V is generally recommended by battery manufacturers. To set up the....
The +5V, 1.6A precision switching power supply circuit is as shown in the figure. This circuit increases the photoelectric coupler (CNY75A) and the adjustable precision parallel regulator (TIA31). R3 is the current limiting resistor, R4 and R5 are the....
The following circuit shows about UHF Indicator Wavemeter Circuit Diagram. This circuit using dual BF494 Transistor. Features: oscillator is ....
This circuit can be used to measure the voltage to 15 volts.Using the current from the battery 9 volt,At 23 mA only. Input circuit has a diode, to protect the....
This simple circuit can be used as an aid for sensing the distance between the rear bumper of the car and any obstacle behind the car. The distance can be understood from the combination of the LEDs (D5 to D7) glowing. At 25cm D7 will glow, at 20 cm D7&D6....
This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen. It was used as part of a firearm training system. It generates a 100mS output pulse whenever it detects a 3ms to 5ms-laser burst,....
This circuit generates the sound of the electronic ringer found in modern telephones, supplanting the 2-bell electromechanical ringers used previously. The ringing pattern follows the United States convention of 2 seconds on, and 4 seconds off. During the....
A bright lamp flashes in sychrony with the lightning bolts indicating the proximity and intensity of the storm....
IC LM2917 IC chip is designed specifically as a Frequency to Voltage Converter or Frequency to Voltage converter. In its use to applications Frequency to Voltage Converter IC LM2917 requires few external components. There are several examples of applications....
A robot that dances to music. G‚ Wouldn`t it be wicked cool to have a cute little robot on your desk dancing to Fatboy Slim Winamp provides a nice API for writing music visualization plug-ins. G‚ I wrote a plug-in that sends signals to the parallelport that....
A amplifier of force RF for the FM, is always essential for the amateur that wants it strengthens some small transmitter, that likely already it has manufactured or has been supplied ready. The present circuit can give 50-60W RF force of expense, with....
The design of solar panel systems with a (lead-acid) buffer battery is normally such that the battery is charged even when there is not much sunshine. This means, however, that when there is plenty of sunshine, a regulator is needed to prevent the battery....
The following is a translation of a section from the first book of the 3 part series "Die RG¶hre im UKW EmpfG¤ng" edited by Dr. Ing. Horst Rothe in 1952. This very interesting section describes a fully differential super-regenerative self-limiting FM....
This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared....
How does one measure small inductances with a precision of at least two, and possibly three, significant digits A search of the literature produced scanty results. One interesting circuit was described in The 2001 ARRL Handbook on p 26. 22. I built a....
Magic Sinewave Analysis using SPICE and a Simple Inverter Circuit...
The following circuit shows about Curtain Control Circuit Diagram. This circuit based on the 555 IC. Features: Switch for manual control, IC and a ....
Software, Applications and Programming Resources. Amateur Radio and Travel. Stereogram Art....
Running the Simple MT 8870 Decoder from your Cell Phone the devise can be operated from any type of DTMF tones like Land Lines, Mobiles, Computers, Radio Transmitters that send DTMF tones over the air waves, Ham Radio sets with DTMF built in to them it has a....
This circuit, a simple mixer circuit. It can mix two signal channels and one channel is output. Using a codec circuit, Convert stereo audio to mono audio time. It can increase the number of channels too. By adding a VR1, R1 and C1 to the amount needed. Then....
Firstly, it demonstrates how the combination of a blue and a white LED can be used to give a realistic imitation of a camera flashlight. Secondly, the goo....
This circuit uses an oscillator (2N2222) and a diode Dl as a nonlinear mixer. The frequency is set by a slug in Ll. RFCl, Cl, and RFC2 form a low-pass filter to pass video and block rffrom the video source..
It`s a power amplifier configuration that was developed in the 1950s. It is called a circlotron because the original idea diagram was drawn as a circle. The best I can do with my graphics program is to show it as a bridge. It`s promise is very low....
Are you a beginner in micro controller projects and are you stuck where to start from if yes, then this is one of the simplest mini projects that you can start from. This mini project will give you a clear understanding of programming your micro controller.....
Calculated the output of the transformer to be 125 times (1000 / 8) higher than input. Since 12v is given as input, output should be 1500v (not sure about this)..
This sunlight-controlled lamp uses a light-dependent resistor (LDR) as the sunlight sensor and a total of 25 high-brightness white LEDs. Separate resistors are connected in series with each row of the LEDs. The working of the circuit is very simple. During....
Locker Guard Circuit Diagram. This tiny circuit can protect your Locker or Almirah from a burglary. If the locker opens in the armed state, the circuit generates a loud police siren to thwart the attempt of burglary ..
This 4 1/2-digit DVM circuit is built around a Maxim ICL7129ACPL A/D converter and LCD driver. An ICL8069 CCZR 1. 2-V band-gap reference diode is used for a voltage reference. S2a-b-c select one of four ranges up to 200 V (maximum). The meter also has a....
I don`t the right place to post this but I`ll try my luck here: I`m looking to build a timer for a pump. I want the pump to run for 5 minutes, then....
As already explained, a monostable multivibrator (MMV) has one stable state and one quasi-stable state. The circuit remains in its stable state till an external triggering pulse causes a transition to the quasi-stable state. The circuit comes back to its....
The following circuit shows about Car Door Keypad Electronic Circuit Diagram. Features: lower pin-count lower cost device, uses an MC68HC908AZ60A, ....
The following circuit shows about Automatic Room Power Control Circuit Diagram. This circuit based on the NE555 IC. Features: uses two LDRs, use ....
For a project I need to display a progress bar of the activity performed by my MCU. For this purpose I am going to use a bargraph display, but the problem is that bargraph display driver driver IC LM3914 uses analog input where as MCU produces a digital....
A light/dark sensing circuit is extremely useful and versatile in a wide range of renewable energy projects from automatic lighting to security systems. In our article Light Dependent Resistor we explained how an LDR can be used in simple circuits to control....
Many RC oscillators use advanced circuit in phase shift unit. It uses a voltage feedback amplifier, of which the gain will get a sharp decline in a higher frequency and stop oscillation before reaching the desired frequency. That is the reason why voltage....
This is a simple application of internal 10-bit ADC(analogto digital converter) of PIC16F676 microcontroller. you can use this circuit to measure up to 30 v dc. the possible applications are on bench top power supply or as a panel meter invarioussystem.....
The above diagram shows the different links to theinputs and outputs of each operational-amplifier from the power source and how each operation amplifier is wired to operate each seperate light emitting diode. Also shows calculations to obtaining each....
This is an early test program (assembly source code), which was stored on the erasable programmable memory chip (EEPROM). Assembler programming is just 1 step above programming at the binary level...
Electronics motor control is a simple circuit made without IC.electronics control of AC motor.circuit diagram with description of electronics motor controller...
Ok. So I`ve bought and sold 10 MK3 Jettas and 1 MK3 Golf. Never posted on a forum before. I paid $400 for a 1994 GTI, in order to fix it and sell it, so theres that. The car ran 2 years ago, when my friend was driving it home from 2.5 hours away, it died on....
found the current in both the loops using Kirchhoff`s Voltage law but then I`m confused on the proper method to find the potential drop between the two loops. I suggest you insert two extra points A and B on both ends of the battery (on the bottom right of....
This circuit is a Mosfet-based linear voltage regulator with a voltage drop of as low as 60mV at 1A. The circuit uses a 15V-0-15V transformer and employs an IRF540 N-channel Mosfet (Q1) to deliver the regulated 12V output. The gate drive voltage required for....
This Adjustable Voltage Regulator is made by combining a common 78L05 with an integrated audio amplifier of the type TDA2030, an adjustable voltage regulat....
The world is going nuts over the Raspberry Pi single-board computer (SBC) for being a whole system under $50. In reality though the Pi isn`t actually the cheapest computing device available. If you want really cheap how does $13. 50 sound for a mini computer....
rfRXD0920 The RFRXD0420 RFRXD0920 are low cost, compact single frequency short-range Radio receivers requiring only a minimum number of external components for a complete receiver system. The RFRXD0420 covers the receive frequency range of 300 MHz to 450 MHz....
The SM5021 series are crystal Oscillator module ICs fabricated in NPCs Molybdenum-gate CMOS, that incorporate high-frequency, low current consumption Oscillator and output Buffer circuits. Highly accurate thin-lm feedback resistors and high-frequency....
The original data sheet for the MK414 states a maximum working frequency is around 4 MHz. SW transmissions are so powerful that this receiver will work well with signals up to about 6 or 7 MHz. The 10k resistor controls the operating voltage for the IC which....
A low power fm pirate radio. The output power is around +35 dBm ( 3. 16 watts) over 50 ohms load and +24 volts power supply. The project consists in a hartley oscillator ( modulated VCO), and tree stages ( Class A, common emitter) of RF amplifiers. The first....
Nowadays, a switch-off delay for the vehicle interior lighting is a naturally a standard feature. However, with certain models having only spartanttings, or older-model vehicles, you`re left sitting in the dark as soon as you climb in and close the door.....
Power demand in portable designs CAN require in some specific application more than 1 A. A method consists in paralleling two DC to DC converters on the same load instead of placing a single higher current converter with lower switching frequency. This....
Many of my friends asked me for automatic on off led circuit or led flashing circuit so here I`m going to post a Astable multivibrator-2 LED flashing circuit. It is a simple astable multivibrator circuit using 2LED (here i used red LED), two NPN small....
The circuit given here is of a very useful and accurate digital voltmeter with LED display using the ICL7107 from Intersil. The ICL7107 is a high performance, low power, 3. 5 digit analog to digital converter. The IC includes internal circuitry for seven....
This simple low voltage tester circuit can be used to monitor battery and other voltage sources of current for problems, by LED display and alarm sound. Which....
This article offers an alternative to efficiency measurements as an evaluation tool of power supplies. The proposed method works well with little dependency on the output voltage and temperature. Power supplies have always been evaluated and compared based....
This Basic MOSFET amplifier is very simple to build and low cost. Is perfect for Hi-Fi amplifiers and instrument amplifiers (guitar, keyboards ). Output power is + / 100 Wrms at 8 ohm load or + / 160 Wrms below 4 ohms. The simplicity of this circuit cause....
Developing a transmitter small enough to be implanted in the body of a rat, fast enough to transmit four hundred sixteen-bit data samples per second, powerful enough to be detected at a range of three meters, and efficient enough to operate for three months....
The circuit shown here should have a lot of applications. Basically, the distribution amplifier takes the composite video signal from a video player (VCR) or a video generator (analogue output) and buffers it in such a way that it can be simultaneously....
As you can see, the audio ground completely isolated from digital ground. And I`m using top copper layer as a shield for both, audio and digital ground. This helps to isolate audio part from picking up noise from digital circuitry and other EMI. Relay....
Circuit schematic above is one of the voltage inverter circuit, starting from 6-Volt input on the DC current into 220-volt AC output. For maximum output power up to 30W only, and is also very small voltage current. Input voltage plus the entrance on the....
