New Circuits Page 174
- Page 174
-
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....
-
-
AD8221 is an excellent candidate for bridge measurement because it has low offset and high CMRR over frequency. The bridge can be directly connected to the....
-
The following circuit shows about 2000W Power Amplifier Circuit Diagram. This circuit using the BC560C Transistor. Features: hard enough to ....
-
-
-
Including Preamp, Tone Controls, Reg dc Power Supply, 18 Watt into 8 Ohm 30W into 4 Ohm loads This project was a sort of challenge: designing an audio a....
-
-
A dimmer for individual LED bulbs. LEDs (light emitting diodes) are very sensitive components - exceed their rated current or voltage and their lifespan can be slashed from 50, 000+ hours to an eventful microsecond. LEDs are current-driven * which means that....
-
This topic will be locked and display all of the circuits and some photos of the devices being worked on in the Joule Thief topic. This is going to take me a while to do so please be patient. If you feel there is an error, or I need to include something else....
-
Built around an Intersil 7216 frequency-counter IC, this counter has a basic range of 10 MHz, a 100-MHz prescaler, and an extra frequency divider (IC3). This divider divides `oy an extra factor, as marked on S7 (see schematic), to extend the range of the....
-
-
This circuit is intended to indicate the power output level of any audio amplifier. It is simple, portable, and displays three power levels that can be set to any desired value....
-
-
The circuitdescribed herecan be built and used in your vehicle for an automatic dipping and dimming operation of the headlamps, in response to the intense lights coming from an opposite vehicle headlamps. You must have come across this irritating situation....
-
-
Beckman model W industrial-type pH meter is d-c amplifier designed for measuring potentials generated by pH-sensitive electrodes. Output will drive most recorders. R32 is used only with 4 to 14 pH meter, and R33 only with -1 to 9 pH meter. -G. C. Car. roll,....
-
This is a standard digital clock circuit,frequency size 1 Hz or 2 Hz. It can be used in the normal clock circuit. It consists of IC-4060 and IC-4013, the...
-
This simple robot, which responds to light and avoids obstacles, can be built without using a microcontroller, programmer or PC. The only special` component in the circuit is a window discriminator (a fancy version of a window comparator). Resistors R1 and....
-
Using the circuit depicted in the schematic diagram below we can monitor the heart pulses of patient. This circuit buffer and amplify the heart pulses, and the....
-
1995 GMC Serria the ABS light comes on and all hell brakes loose, thrans shifts into limp mode, rpm shoots everywhere, speedo does not work. figured it might be the front wheel sensors I don`t think it`s the wheel speed sensors. It sounds like you`re losing....
-
Resistor change in ECM Mic Preamplifier schematic diagram. The electret condenser microphone (ECM) contains a very sensitive microphone element and an internal FET preamp, a power supply in the range 2 to 10 volts DC is therefore necessary. Suitable ECM`s....
-
Use a voltage to frequency conversion chip along with an analog temperature sensor such as LM335 or a thermistor, and then transmit the modulated frequency signal via an RF data link module. Alternatively, we can use a digital temperature sensor and sending....
-
Learn how to interface LCD 16x2 with 8051. Download free source code on LCD interfacing with 8051 Microcontroller ..
-
A MOSFET that drives a load. The load has a sense resistor in its current path and its voltage is used to trigger a circuit that can disconnect the load if we detect an over current condition. But it wasn`t that easy. Many kinds of loads generate large....
-
-
A light based sensor using an LDR (Light detecting resistor) and ofcourse an Op Amp. You can use this circuit to make line followers and other stuff. Here we go: Since we are using an op amp to compare we should first be clear about its functioning.....
-
-
Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the opamp and energize the relay and light the LED. Swapping the position of the< thermistor and 47k resistor makes a cold or frost alarm...
-
Both transistors should be low noise types. In the original circuit, I used BC650C which is an ultra low noise device. These transistors are now hard to find but BC549C or BC109C are a good replacement. The circuit is self biasing and will set its quiescent....
-
Externally, the chassis looks identical to the 22BD. Exception: the 22BD has the jack for the speaker connection - two female sockets - on the right (antenna) side of the chassis; the 3BTD has a 3" harness (Black and Green wires) exiting the left side (same....
-
This is a circuit of negative resistance circuits. All of the preceding circuits rely on RC time constants to achieve resonance. LC combinations can also be used and offer good frequency stability, high Q and fast starting. In the circuit, signal input is....
-
There is one slight drawback to our flashing LED program. Each instruction takes one clock cycle to complete. If we are using a 4MHz crystal, then each instruction will take 1/4MHz, or 1uS to complete. As we are using only 5 instructions, the LED will turn....
-
-
The LMV116 is an enhanced slew rate version of the LMH6645. The high speed LMH devices are very sensitive to output capacitance (normally they drive back-terminated loads) and normally start oscillating with direct capacitive loads as low as 50pF. I just....
-
I am not a great fan of novelty radios, but this one looks swell on the wall and doesn`t take up any shelf space. The Guild "Country Belle" is one of the most recognizable tube novelty radios. Patterned after an old-fashioned wall telephone, this model was....
-
What is SMPS? Switched Mode Power Supplies (SMPS) belongs to the category of D.C. to D.C. converters and D.C. to A.C. Converters ..
-
The excellent high input impedance, high slew rate, and high voltage qualities of CA3140 op-amp make it suitable for Wien-bridge sine wave oscillator. The basic circuit for Wien-bridge sine wave oscillator is shown in the figure below (the upper part). You....
-
-
This design will interest technicians who work on pneumatically operated valves and other 4-20mA current loop controlled devices. Although 4-20mA signal injector/calibrators are available, this one is both cheap to build and easy to operate. When first....
-
Almost all 24V power systems in trucks, 4WDs, RVs, boats, etc, employ two series-connected 12V lead-acid batteries. The charging system can only maintain the sum of the individual battery voltages. If one battery is failing, this circuit will light a LED.....
-
Make it a habit to check the temperature gauge every 5-10 miles. The temperature gauge can tell you a lot about the car`s health. The needle moving from its usual position in traffic only slightly, for example, is an indicator of a failing thermostat. If you....
-
-
A circuit that can turn off head lights/lamps of a car/vehicle automatically after a preset time.This light switching circuit is built using 555 timer IC...
-
Simple FM transmitter with a single transistor. Mini FM transmitters take place as one of the standard circuit types in an amateur electronics fan`s beginning steps. When done right, they provide very clear wireless sound transmission through an ordinary FM....
-
Schematic diagram below shows an ADP1821 Step Down DC-to-DC Converter circuit. This circuit uses ADP1821 that can be used to regulate an output with a load of more than 20 A. It can be done if he power components like MOSFETs, the bulk capacitors and the....
-
This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It has two ranges: when SW1 is set as shown in the circuit diagram, the device can test 3V to 15V batteries. When SW1 is switched to the other....
-
This FM transmitter electronic project works in FM band and it has a transmission power around 250mW. This FM transmitter electronic circuit is very simple and is based on some common transistors and electronic parts. T1 transistor can be a BC107, BC171 or....
-
It`s just a AN2131 chip with the required support circuitry - crystal oscillator, power regulators etc. First I took the inputs and outputs of the key matrix and wired them to the GPIO ports of the AN2131. This was just a matter of plugging the whole lot....
-
Communication in F.M. band is easy.circuit diagram with description of Power Full F.M. receiver using single IC receive 88 MHz to 108 MHz frequency in F.M. band,...
-
This is a 2 MHz crystal circuit using CMOS pair. This circuit is ideal for uses in digital watches and clock because this circuit has low power drain. The oscillator in this circuit is built by connecting the One CMOS transistor pair from CA3600E array with....
-
IC TA8210AH By using this you can apply a series of audio power amplifier is the car audio system. In general, all the speakers in the car using a subwoofer speaker, and woofer. Because the car is not big room so the sound is being required is not too high.....
-
This PIC-based hardware circuit accepts texts from a PS/2 keyboard and converts it into a morse code audio signal....
-
With just a low cost DC adapter and the circuit described here it is possible to build a low cost stabilized, uninterruptable 9V supply. On the grounds of safety and economy, a simple unstabilized 12V D. C. adapter is used as the power source, a universal....
-
Nowadays, just about every house has an outside lamp with a motion sensor. Such a device eliminates the need to feel your way to the front door, and it apparently also scares away intruders. The only problem is that free-running dogs and cats in the....
-
Hi, I bought two small servo motors last month. I was thinking what I can do with this two servo, since it is only two in number. Then I asked this to my friend Achu Wilson and he suggested me to try a four legged two servo walker and he shown a youtube....
-
One of the author`s physics projects required an accurate 1-Hz (seconds) clock signal. Unfortunately, precision 10-MHz quartz crystals are expensive, while another problem was found in the inability of most common or garden 40xx CMOS logic chips to work at....
-
Circuit diagram is designed to strengthen the input of a telescopic whip antenna. The Preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz. Tuning voltage is supplied via RV2, a 10k potentiometer connected to the 12 Volt power....
-
Here is a very interesting project / schematic of a touch alarm circuit. The circuit is quite sensitive and it will activate a peizo or any other buzzer and an LED for a set time period when any one touches the metal plate....
-
The Biquad consists of two successive integration stages followed by an inverting stage. The entire group has a feedback loop from the front to the back consisting of R1 which is chiefly responsible for controlling the center frequency, ‰o. The first stage....
-
What is the meaning of the picture above The above picture is a miniature audio amplifier and very simple. Here I will give an audio amplifier schematic is very simple which only requires a few components only, can be seen under this scheme. See from above....
-
L2 RFC (resistance 1MOhm with wrapped around her inductor of enough coils from fine isolated wire. Scratch of utmost inductor and you stick in utmost the resistance making thus a parallel L-r circuit. ) With their C7, C8 we adapt the resistance of aerial....
-
A simple circuit for monitoring the fuel level in vehicles. It gives an audiovisual indication when the fuel level drops alarmingly below the reserve level, helping you to read more †’..
-
Notch filter is a filter that remove a certain B. Ideally a notch filter will remove only single point of frequency component, but practically it will remove....
-
Installing the camera in office, home, or the shop becomes economically feasible because the price of security camera going down. It is not efficient if we....
-
-
Most small internal-combustion engines commonly used in the model-building world use glow plugs for starting. Unfortunately, glow plugs have an operating voltage of 1. 5 V, while fuel pumps, starter motors, chargers and the like generally run on 12 V. This....
-
You need to wire 8 Max6675 ics to a microcontroller. You can parallel all the clock inputs. The NCS lines of numbers 1 and 2, 3 and 4 etc can be connected together. The SO lines of all the odd numbered Max6675 can be connected together, as can the even ones.....
-
A continuously working wiper in a car may prove to be a nuisance, especially when it is not raining heavily. By using the circuit described here one can vary sweeping rate of the wiper from once a second to once in ten seconds The circuit comprises two timer....
-
This time delay relay circuit is built with IC NE/SE555, produced by Intersil which contains a precision timer. Stability to temperature variations is 0.00....
-
-
One thing your not suppose to do to an old radio or TV that hasn`t been run for many years is just go and plug the thing in and flip the power switch on. The best thing to do is use a device called a Variac which allows you to slowly bring up the power to a....
-
-
I have been working on driving an analog VU meter based on the sound going out the Raspberry Pi`s audio outputs. This now works! The music [1] is playing from a Raspberry Pi, with software running on the Pi digitally sampling the peak output audio level and....
-
The material is presented in a manner suitable for a teaching tool. It seeks to enlighten and to spark off interest in the design of counters. As R. S. S Obermann remarks ". design of counters has, in my experience, always been an excellent proving ground....
-
This is the electronic schematic of the homebuilt SONAR. Only one piezoelectric transducer is used for both transmit & receive. This transducer is switched from TX to RX via the four 4016 switches. A high gain amplifier stage & rectifier translates the....
-
VU meter or a volume unit meter is a device used for indicating the music volume output from an amplifier or a loudspeaker system. It may be also considered as a device for displaying the PMPO of the amplifier at a particular volume setting. Though the unit....
-
The Dodge Aspen was a compact car produced from from 1976 to 1980 by Chrysler Corporation`s Dodge division. The 1976 Aspen model year, was available as a 2-door coupG©, 4-door sedan or 4-door station wagon, it came in three trim levels base, Custom and SE....
-
This simple circuit tests speakers, microphones, transformers and voltage. It`s basically a very low frequency oscillator that produces extremely short `fruity` pulses. The type of sound produced is very easy to hear and to determine the precise direction it....
-
Pressing the pushbutton of the transmitter, a sound and/or light alert is activated in the receiver. The system uses no wiring or radio frequencies: the transmitted signal is conveyed into the mains supply line. It can be used at home, in any room from attic....
-
-
The TDA1029 is a dual operational amplifier (connected as an impedance converter) each amplifier having 4 mutually switchable inputs which are protected by clamping diodes. Signal-sources switch can be made in various mods : Electronic parts required by this....
-
Single chip 2.4 GHz Transceiver NRF24L01 is a single chip Radio transceiver for the world wide 2.4 - 2.5 GHz ISM band..
-
-
Acquired an old Eistar SJ-1 Digital pulser. However the frequency it generates is always 66% of what its supposed to produce. Turns out that the frequency coming out of the frequency stage(at Pin 11)is 66% of the 16MHz crystal or about 10. 6MHz. (The 74LS38....
-
All feature crystal-controlled transmitters and tunable superregenerative receivers with RF preamplifiers designed for operation on the 2, 6 or 10 meter amateur bands. The highly sensitive receivers pull in signals as low as 1 microvolt and produce complete....
-
The analog display consists of a frequency/voltage converter (IC12) and bar-graph segment drivers IC10 and IC11. R34 is the calibration adjustment and is set so that an engine rpm of 5 000 to 7000 rpm lights the first LED (redline value)..
-
Terminology TS555 a single CMOS timer which offers very low power consumption and high frequency where the timing remains very accurate in monostable or astable mode while providing reduced supply current spikes during output transitions, which enables the....
-
-
Make a very cheap, relatively easy to construct robot which will wake up any time you shine a desk lamp on it. There are no sensors on it, although I....
-
I`ve built a 555 based oscillator to drive ir led at 38khz. I`ve got the circuit wired up and I`ve used my meter on the duty setting to read that it is indeed generated a 38khz signal. I`ve also wired up a modulated IR receiver, the one from radio shack set....
-
Before examining the various analog to d igital (A-D) and digital to analog (D-A) conversion processes it is useful to review the properties of each type of representation; in particular this may help select the representation most suited to the problem at....
-
-
The M7 capsule is a center-terminated, dual-diaphragm design, and supports three polar patterns. A switch on the power supply allows selection of Cardioid, Figure-of-8, or Omnidirectional patterns. The amplifier circuit is similar to some of Gefell`s....
-
A 52 MHz third overtone crystal is typically 30 ohms at its series resonance according to manufacturer specifications. The crystals used for the prototypes have nearly ten times lower series resistance but they were very expensive. An oscillator can be seen....
-
-
This is the first part of my Arduino controlled PWM RGB LED project, featuring distance / PIR sensor control and sleep mode....
-
-
The 12KV High Voltage Generator beneath uses an abnormal adjustment to accomplish about 12, 000 volts with about 5uA of current. Two SCRs anatomy two beating architect circuits. The two SCRs acquittal a 0. 047uF a 400v capacitor through a xenon lamp activate....
-
-
For this project, we`re going to demonstrate how a capacitor can supply a pulse signal to a speaker. We`re going to charge a capacitor and then discharge the voltage of the capacitor to a speaker. The speaker, a transducer which turns electrical signals into....
-
An audio signal applied to VI is passed through the operational amplifier 741, U2. After being amplified, the output signal V2 is sampled and applied to a negative voltage doubler / rectifier circuit composed of diodes CRI and CR2, with the capacitor C1. The....
-
At high speed, visually checking your speedometer to keep under maximum speed can be dangerous. It will be much safer if we put an audio alarm system to give a....
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....
AD8221 is an excellent candidate for bridge measurement because it has low offset and high CMRR over frequency. The bridge can be directly connected to the....
The following circuit shows about 2000W Power Amplifier Circuit Diagram. This circuit using the BC560C Transistor. Features: hard enough to ....
Including Preamp, Tone Controls, Reg dc Power Supply, 18 Watt into 8 Ohm 30W into 4 Ohm loads This project was a sort of challenge: designing an audio a....
A dimmer for individual LED bulbs. LEDs (light emitting diodes) are very sensitive components - exceed their rated current or voltage and their lifespan can be slashed from 50, 000+ hours to an eventful microsecond. LEDs are current-driven * which means that....
Built around an Intersil 7216 frequency-counter IC, this counter has a basic range of 10 MHz, a 100-MHz prescaler, and an extra frequency divider (IC3). This divider divides `oy an extra factor, as marked on S7 (see schematic), to extend the range of the....
This circuit is intended to indicate the power output level of any audio amplifier. It is simple, portable, and displays three power levels that can be set to any desired value....
The circuitdescribed herecan be built and used in your vehicle for an automatic dipping and dimming operation of the headlamps, in response to the intense lights coming from an opposite vehicle headlamps. You must have come across this irritating situation....
Beckman model W industrial-type pH meter is d-c amplifier designed for measuring potentials generated by pH-sensitive electrodes. Output will drive most recorders. R32 is used only with 4 to 14 pH meter, and R33 only with -1 to 9 pH meter. -G. C. Car. roll,....
This is a standard digital clock circuit,frequency size 1 Hz or 2 Hz. It can be used in the normal clock circuit. It consists of IC-4060 and IC-4013, the...
This simple robot, which responds to light and avoids obstacles, can be built without using a microcontroller, programmer or PC. The only special` component in the circuit is a window discriminator (a fancy version of a window comparator). Resistors R1 and....
Using the circuit depicted in the schematic diagram below we can monitor the heart pulses of patient. This circuit buffer and amplify the heart pulses, and the....
1995 GMC Serria the ABS light comes on and all hell brakes loose, thrans shifts into limp mode, rpm shoots everywhere, speedo does not work. figured it might be the front wheel sensors I don`t think it`s the wheel speed sensors. It sounds like you`re losing....
Resistor change in ECM Mic Preamplifier schematic diagram. The electret condenser microphone (ECM) contains a very sensitive microphone element and an internal FET preamp, a power supply in the range 2 to 10 volts DC is therefore necessary. Suitable ECM`s....
Use a voltage to frequency conversion chip along with an analog temperature sensor such as LM335 or a thermistor, and then transmit the modulated frequency signal via an RF data link module. Alternatively, we can use a digital temperature sensor and sending....
Learn how to interface LCD 16x2 with 8051. Download free source code on LCD interfacing with 8051 Microcontroller ..
A MOSFET that drives a load. The load has a sense resistor in its current path and its voltage is used to trigger a circuit that can disconnect the load if we detect an over current condition. But it wasn`t that easy. Many kinds of loads generate large....
A light based sensor using an LDR (Light detecting resistor) and ofcourse an Op Amp. You can use this circuit to make line followers and other stuff. Here we go: Since we are using an op amp to compare we should first be clear about its functioning.....
Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the opamp and energize the relay and light the LED. Swapping the position of the< thermistor and 47k resistor makes a cold or frost alarm...
Both transistors should be low noise types. In the original circuit, I used BC650C which is an ultra low noise device. These transistors are now hard to find but BC549C or BC109C are a good replacement. The circuit is self biasing and will set its quiescent....
Externally, the chassis looks identical to the 22BD. Exception: the 22BD has the jack for the speaker connection - two female sockets - on the right (antenna) side of the chassis; the 3BTD has a 3" harness (Black and Green wires) exiting the left side (same....
This is a circuit of negative resistance circuits. All of the preceding circuits rely on RC time constants to achieve resonance. LC combinations can also be used and offer good frequency stability, high Q and fast starting. In the circuit, signal input is....
There is one slight drawback to our flashing LED program. Each instruction takes one clock cycle to complete. If we are using a 4MHz crystal, then each instruction will take 1/4MHz, or 1uS to complete. As we are using only 5 instructions, the LED will turn....
The LMV116 is an enhanced slew rate version of the LMH6645. The high speed LMH devices are very sensitive to output capacitance (normally they drive back-terminated loads) and normally start oscillating with direct capacitive loads as low as 50pF. I just....
I am not a great fan of novelty radios, but this one looks swell on the wall and doesn`t take up any shelf space. The Guild "Country Belle" is one of the most recognizable tube novelty radios. Patterned after an old-fashioned wall telephone, this model was....
What is SMPS? Switched Mode Power Supplies (SMPS) belongs to the category of D.C. to D.C. converters and D.C. to A.C. Converters ..
The excellent high input impedance, high slew rate, and high voltage qualities of CA3140 op-amp make it suitable for Wien-bridge sine wave oscillator. The basic circuit for Wien-bridge sine wave oscillator is shown in the figure below (the upper part). You....
This design will interest technicians who work on pneumatically operated valves and other 4-20mA current loop controlled devices. Although 4-20mA signal injector/calibrators are available, this one is both cheap to build and easy to operate. When first....
Almost all 24V power systems in trucks, 4WDs, RVs, boats, etc, employ two series-connected 12V lead-acid batteries. The charging system can only maintain the sum of the individual battery voltages. If one battery is failing, this circuit will light a LED.....
Make it a habit to check the temperature gauge every 5-10 miles. The temperature gauge can tell you a lot about the car`s health. The needle moving from its usual position in traffic only slightly, for example, is an indicator of a failing thermostat. If you....
A circuit that can turn off head lights/lamps of a car/vehicle automatically after a preset time.This light switching circuit is built using 555 timer IC...
Simple FM transmitter with a single transistor. Mini FM transmitters take place as one of the standard circuit types in an amateur electronics fan`s beginning steps. When done right, they provide very clear wireless sound transmission through an ordinary FM....
Schematic diagram below shows an ADP1821 Step Down DC-to-DC Converter circuit. This circuit uses ADP1821 that can be used to regulate an output with a load of more than 20 A. It can be done if he power components like MOSFETs, the bulk capacitors and the....
This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It has two ranges: when SW1 is set as shown in the circuit diagram, the device can test 3V to 15V batteries. When SW1 is switched to the other....
This FM transmitter electronic project works in FM band and it has a transmission power around 250mW. This FM transmitter electronic circuit is very simple and is based on some common transistors and electronic parts. T1 transistor can be a BC107, BC171 or....
It`s just a AN2131 chip with the required support circuitry - crystal oscillator, power regulators etc. First I took the inputs and outputs of the key matrix and wired them to the GPIO ports of the AN2131. This was just a matter of plugging the whole lot....
Communication in F.M. band is easy.circuit diagram with description of Power Full F.M. receiver using single IC receive 88 MHz to 108 MHz frequency in F.M. band,...
This is a 2 MHz crystal circuit using CMOS pair. This circuit is ideal for uses in digital watches and clock because this circuit has low power drain. The oscillator in this circuit is built by connecting the One CMOS transistor pair from CA3600E array with....
IC TA8210AH By using this you can apply a series of audio power amplifier is the car audio system. In general, all the speakers in the car using a subwoofer speaker, and woofer. Because the car is not big room so the sound is being required is not too high.....
This PIC-based hardware circuit accepts texts from a PS/2 keyboard and converts it into a morse code audio signal....
With just a low cost DC adapter and the circuit described here it is possible to build a low cost stabilized, uninterruptable 9V supply. On the grounds of safety and economy, a simple unstabilized 12V D. C. adapter is used as the power source, a universal....
Nowadays, just about every house has an outside lamp with a motion sensor. Such a device eliminates the need to feel your way to the front door, and it apparently also scares away intruders. The only problem is that free-running dogs and cats in the....
Hi, I bought two small servo motors last month. I was thinking what I can do with this two servo, since it is only two in number. Then I asked this to my friend Achu Wilson and he suggested me to try a four legged two servo walker and he shown a youtube....
One of the author`s physics projects required an accurate 1-Hz (seconds) clock signal. Unfortunately, precision 10-MHz quartz crystals are expensive, while another problem was found in the inability of most common or garden 40xx CMOS logic chips to work at....
Circuit diagram is designed to strengthen the input of a telescopic whip antenna. The Preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz. Tuning voltage is supplied via RV2, a 10k potentiometer connected to the 12 Volt power....
Here is a very interesting project / schematic of a touch alarm circuit. The circuit is quite sensitive and it will activate a peizo or any other buzzer and an LED for a set time period when any one touches the metal plate....
The Biquad consists of two successive integration stages followed by an inverting stage. The entire group has a feedback loop from the front to the back consisting of R1 which is chiefly responsible for controlling the center frequency, ‰o. The first stage....
What is the meaning of the picture above The above picture is a miniature audio amplifier and very simple. Here I will give an audio amplifier schematic is very simple which only requires a few components only, can be seen under this scheme. See from above....
L2 RFC (resistance 1MOhm with wrapped around her inductor of enough coils from fine isolated wire. Scratch of utmost inductor and you stick in utmost the resistance making thus a parallel L-r circuit. ) With their C7, C8 we adapt the resistance of aerial....
A simple circuit for monitoring the fuel level in vehicles. It gives an audiovisual indication when the fuel level drops alarmingly below the reserve level, helping you to read more †’..
Notch filter is a filter that remove a certain B. Ideally a notch filter will remove only single point of frequency component, but practically it will remove....
Installing the camera in office, home, or the shop becomes economically feasible because the price of security camera going down. It is not efficient if we....
Most small internal-combustion engines commonly used in the model-building world use glow plugs for starting. Unfortunately, glow plugs have an operating voltage of 1. 5 V, while fuel pumps, starter motors, chargers and the like generally run on 12 V. This....
You need to wire 8 Max6675 ics to a microcontroller. You can parallel all the clock inputs. The NCS lines of numbers 1 and 2, 3 and 4 etc can be connected together. The SO lines of all the odd numbered Max6675 can be connected together, as can the even ones.....
A continuously working wiper in a car may prove to be a nuisance, especially when it is not raining heavily. By using the circuit described here one can vary sweeping rate of the wiper from once a second to once in ten seconds The circuit comprises two timer....
This time delay relay circuit is built with IC NE/SE555, produced by Intersil which contains a precision timer. Stability to temperature variations is 0.00....
One thing your not suppose to do to an old radio or TV that hasn`t been run for many years is just go and plug the thing in and flip the power switch on. The best thing to do is use a device called a Variac which allows you to slowly bring up the power to a....
I have been working on driving an analog VU meter based on the sound going out the Raspberry Pi`s audio outputs. This now works! The music [1] is playing from a Raspberry Pi, with software running on the Pi digitally sampling the peak output audio level and....
The material is presented in a manner suitable for a teaching tool. It seeks to enlighten and to spark off interest in the design of counters. As R. S. S Obermann remarks ". design of counters has, in my experience, always been an excellent proving ground....
This is the electronic schematic of the homebuilt SONAR. Only one piezoelectric transducer is used for both transmit & receive. This transducer is switched from TX to RX via the four 4016 switches. A high gain amplifier stage & rectifier translates the....
VU meter or a volume unit meter is a device used for indicating the music volume output from an amplifier or a loudspeaker system. It may be also considered as a device for displaying the PMPO of the amplifier at a particular volume setting. Though the unit....
The Dodge Aspen was a compact car produced from from 1976 to 1980 by Chrysler Corporation`s Dodge division. The 1976 Aspen model year, was available as a 2-door coupG©, 4-door sedan or 4-door station wagon, it came in three trim levels base, Custom and SE....
This simple circuit tests speakers, microphones, transformers and voltage. It`s basically a very low frequency oscillator that produces extremely short `fruity` pulses. The type of sound produced is very easy to hear and to determine the precise direction it....
Pressing the pushbutton of the transmitter, a sound and/or light alert is activated in the receiver. The system uses no wiring or radio frequencies: the transmitted signal is conveyed into the mains supply line. It can be used at home, in any room from attic....
The TDA1029 is a dual operational amplifier (connected as an impedance converter) each amplifier having 4 mutually switchable inputs which are protected by clamping diodes. Signal-sources switch can be made in various mods : Electronic parts required by this....
Single chip 2.4 GHz Transceiver NRF24L01 is a single chip Radio transceiver for the world wide 2.4 - 2.5 GHz ISM band..
Acquired an old Eistar SJ-1 Digital pulser. However the frequency it generates is always 66% of what its supposed to produce. Turns out that the frequency coming out of the frequency stage(at Pin 11)is 66% of the 16MHz crystal or about 10. 6MHz. (The 74LS38....
All feature crystal-controlled transmitters and tunable superregenerative receivers with RF preamplifiers designed for operation on the 2, 6 or 10 meter amateur bands. The highly sensitive receivers pull in signals as low as 1 microvolt and produce complete....
The analog display consists of a frequency/voltage converter (IC12) and bar-graph segment drivers IC10 and IC11. R34 is the calibration adjustment and is set so that an engine rpm of 5 000 to 7000 rpm lights the first LED (redline value)..
Terminology TS555 a single CMOS timer which offers very low power consumption and high frequency where the timing remains very accurate in monostable or astable mode while providing reduced supply current spikes during output transitions, which enables the....
Make a very cheap, relatively easy to construct robot which will wake up any time you shine a desk lamp on it. There are no sensors on it, although I....
I`ve built a 555 based oscillator to drive ir led at 38khz. I`ve got the circuit wired up and I`ve used my meter on the duty setting to read that it is indeed generated a 38khz signal. I`ve also wired up a modulated IR receiver, the one from radio shack set....
Before examining the various analog to d igital (A-D) and digital to analog (D-A) conversion processes it is useful to review the properties of each type of representation; in particular this may help select the representation most suited to the problem at....
The M7 capsule is a center-terminated, dual-diaphragm design, and supports three polar patterns. A switch on the power supply allows selection of Cardioid, Figure-of-8, or Omnidirectional patterns. The amplifier circuit is similar to some of Gefell`s....
A 52 MHz third overtone crystal is typically 30 ohms at its series resonance according to manufacturer specifications. The crystals used for the prototypes have nearly ten times lower series resistance but they were very expensive. An oscillator can be seen....
This is the first part of my Arduino controlled PWM RGB LED project, featuring distance / PIR sensor control and sleep mode....
The 12KV High Voltage Generator beneath uses an abnormal adjustment to accomplish about 12, 000 volts with about 5uA of current. Two SCRs anatomy two beating architect circuits. The two SCRs acquittal a 0. 047uF a 400v capacitor through a xenon lamp activate....
For this project, we`re going to demonstrate how a capacitor can supply a pulse signal to a speaker. We`re going to charge a capacitor and then discharge the voltage of the capacitor to a speaker. The speaker, a transducer which turns electrical signals into....
An audio signal applied to VI is passed through the operational amplifier 741, U2. After being amplified, the output signal V2 is sampled and applied to a negative voltage doubler / rectifier circuit composed of diodes CRI and CR2, with the capacitor C1. The....
At high speed, visually checking your speedometer to keep under maximum speed can be dangerous. It will be much safer if we put an audio alarm system to give a....
