Transistor Tester
This circuit can measure both small signal hfe and DC current gain hFE of a low to medium power power transistor.....
EMF Probe Version 2
An electromagnetic field probe designed to detect changing electric and magnetic fields.....
Coulomb meter
Another cause of voltage drift is the input current of IC1, which slowly charges capacitor C1, this can especially be seen when the output voltage is about 0 Vo...
A radiation detector with a solid-state PIN-diode sensor
I saw a cool app-note from Maxim that described a gamma-photon detector which used a regular PIN-diode as a sensor. The actual circuit looked simple enough so I...
High Side Current Monitor
Monitoring current on inductive loads is a common task. It`s easier to do on the low side of a driving circuit, because a simple resistor can be used with an op...
Ultrasonic Distance Measurement With The Msp430
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SC1437 Precision Voltage Detector With Programmable Trigger Voltage & Timer Delay - Semtech Corporation
The SC9256 is phase-locked loop (PLL) LSIs for digital tuning systems (DTS) with built in 2 modulus prescalers. All functions ate controlled through 3 serial bu...
IR3721 Power Monitor IC With Analog Output
International Rectifier`s IRAM109-015SD is a multi-chip Hybrid IC developed for low power appliance motor control applications such as Fans, Pumps, refrigerator...
ICM7226B 8-digit Multi-function Frequency Counter/timer Corporation
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High Resolution Digital Weigh-scale Design Using Z8 Encore! ?® Microcontrollers
This circuit SP6691 has been designed to provide a high output voltage with a lower voltage boost Regulator by adding a charge pump circuit. This circuit CAN ta...
Heart-rate And Ekg Monitor Using The Msp430fg439
The HV9911DB1v2 is an LED Driver capable of driving up to 20 one-watt LEDs in series from an input of 21 27V DC. The demoboard uses Supertex`s HV9911 in a boost...
Evaluation Board For Single Supply 12-bit 500 Ksps Adc
This data sheet describes the evaluation board for the AD9834 direct digital synthesizer (DDS). The AD9834 is a numerically controlled Oscillator using a phase ...
Digital Blood Pressure Meter
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8-direction Digital Compass Using Z8 Encore
TheM-8880 is a completeDTMF Transmitter/Receiver that fea- tures adjustable guard time, Automatic Tone burst mode, call progressmode, and a fully compatible 650...
I2C Anemometer cheap wind data logger
The board is rather simple and is based on a PCF8574 providing to the I2C the output of a CD 4040 counter. A dip switch is provided to select the PCF8574 addres...
The E-meter
To measure the frequency response of the e-meter, a Wein Bridge oscillator, oscilloscope, and single-ended power supply were used. (Ironically, a bridge oscilla...
speedometer project
A simple low cost Infrared LED speedometer is described that can be fitted to a skateboard, longboard or even a bicycle to measure speed. Notes on building, set...
Digital frequency counter
The frequency measurement is one of the most important things in radio construction. Without it you will be unable to set desired frequency in your receiver (an...
3 digits Digital volt meter
This is simple 3-digits digital volt meter. PIC16F676 used to read analog signal(voltage) and display the value on 3-digits 7-segment. You can apply to mesasure...
Frequency Voltage ConverterCircuit Using The LM331 IC
The following circuit shows about Frequency Voltage Converter Circuit. This circuit based on the LM331 IC, Features:15V DC as the accumulation .....