Projects Projects
Voltmeter + Ammeter LCD panel
Introduction This multimeter was designed to measure output voltage and current in a PSU, where the current sense shunt resistor is connected in series with load at the negative voltage rail.
Simple Crystal Tester
Description Transistor Q1, a 2N3563, and its associated components form an oscillator circuit that will oscillate if, and only if, a good crystal is connected to the test clips.
Transistor tester
Description This is basically a high gain amplifier with feedback that causes the LED to flash at a rate determined by the 10u and 330k resistor.
Logic Probe Plus
This project is based on a probe logic states, capable of measuring levels from TTL (5v) to state levels of PLC’s (24v).
Logic Probe
Description This circuit is a Logic Probe.
Led display digital Voltmeter
Copyright of this circuit belongs to Smart kit electronics.
Mosfet Tester
This is a variation on the astable multivibrator.
Phone Busy Indicator
Have you ever been using the modem or fax and someone else picks up the phone, breaking the connection?
Phone line indicator
Description With this circuit you can monitor your telephone line.
Electronic Stethoscope
Circuit Description U1a operates as a low-noise microphone preamp.
Plants Watering Watcher
Using a Veroboard mother-board about the same size as the battery holder, a daughter-board was added to hold the remaining parts.
PIR Sensor
This project is an automatic PIR sensor.