ELECTRONIC CIRCUITS
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Car Parking Sensor
This circuit was designed as an aid in parking the car near the garage wall when backing up. LED D7 illuminates when bumper-wall distance is about 20 cm., D7+D6 illuminate at about 10 cm. and D7+D6+D5 at about 6 cm. In this manner you are alerted when approaching too close to the wall.All distances …
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20 Watt Automotive Power Amplifier - LM2005
The high current capability of the LM2005 allows it to continuously endure either AC or DC short circuit of the output with a maximum supply voltage of 16V. This will protect theloudspeaker in a bridge mode, when a DC short of the output occurs on one side of the speaker. The device will prevent the …
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Water Level Indicator
This electronic circuit is a water level Indicator. It is simple and practical measure and know the level of reservoir. The component IC CMOS 4066 used as switcher on any level detector/sensor that connect the negative polarity pin of each LED to ground. Buzzer will be sounded if full level sensor …
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AC Ohmmeter - ESR Meter
The ESR Meter is basically an AC Ohmmeter with special scales and protective circuitry. It provides a continuous reading of series resistance in electrolytic capacitors. It operates at 100 kHz to keep the capacitive reactance factor near zero. The remaining series resistance is due to the electrolyt …
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A Tiny pH-Meter
This electronic circuit is a tiny pH-meter. It is very tiny: 11cm2 including the PSU circuit! The schematic is shown below. It is basically a simple gain/offset circuit with a high impedance input (several giga-Ohm) and frankly the explanation could stop here: anyone with an background in electronic …
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Net-Enabled Alarm Clock
Unlike old-school mechanical alarm clocks that you have to set manually, DJs Internet-connected alarm clock provides three primary features: automatic time setting on power-up, streaming MP3 music, and remote management. The PIC24FJ64-based clock is connected to an ENC28J60 Ethernet chip, an MP3 de …
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USB Audio D/A Converter
This electronic circuit is an high quality preamplifier with built-in DAC from SPDIF or USB for my power amplifier Leachamp. I had available circuit PCM2902. I tried to design DAC from USB with this circuit on one-sided PCB and I was succesful.Schematics is from datasheet of PCM2902. Circuit include …
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3 Digit Frequency Meter for SwissFlow Flowsensor
This electronic circuit is ment to digitally display the output of my electronic Swissflow SF800 flow sensor. This sensor puts out an open collector square wave signal (like a fan RPM monitoring signal) between 50Hz (=0.5 liter/minute) and 2000Hz (=20 liter/minute). By dividing the measured frequenc …
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PIC Countdown Timer
The purpose of this timer is to provide a countdown time from 1 second to 99 minutes & 59 seconds. I use it to control the lighting for the Ultra-Violet exposure of photosensitive PCB material. The project provides also an audible alarm at the end of the countdown time and switches the UV lights …
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Ultrasonic Parking Sonar
This circuit electronic is an ultrasonic parking sonar. Based on an ultrasonic amplifier from an article seen on a 1982 magazine, it was once installed on the rear bumper of my Volvo Station Wagon. It served very well for many years. Connecting it to the reverse gear lights, it switches on automatic …
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100W Transistor Based Audio Amplifier
This electronic circuit is an exceptionally well designed amplifier, with a lot of power reserve, high fidelity, low distortion, good S/N ratio, high sensitivity, low consumption and full protection. Having all these almost ideal characteristics this amplifier is likely to become the basic building …
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32 Outputs MIDI Decoder
This electroni circuit is the description a 32 outputs MIDI able to switch relays, electromagnetics devices in order to automate a mechanical musical instrument, or command lights. MIDI datas from a musical instrument equipped with an MIDI output or from a sound card of a computer are analyzed by th …
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ARM7 Oled Clock AT91SAM7S64
This project report describes the motivation and decisions behind the design and implementation of a clock, as well as the results. It is a clock based on an ARM7 microcontroller (Atmel AT91SAM7S64) using a 128x128 pixel full-color organicLED display (Univision UG-2828GFEFF01) as the output. The clo …
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ELECTRONIC CIRCUITS
