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electrical live wire detector circuit schematic

Electrical Live Wire Detector

P. Marian - 05/19/13

This circuit can detect only electrical wires connected to the mains (live wire). It has an LED for [...]
automatic fan controller circuit schematic

Automatic Fan Controller

P. Marian - 04/17/13

The automatic fan controller circuit shown in the schematic has 2 comparators with different triggering points that are [...]
Trailer Stop & Turn Converter Schematic 2

Trailer Stop & Turn Signal Converter

Jim Keith - 04/05/13

If you ever wondered why your trailer Stop/Turn signal lamps are so dim you are not alone. The [...]
Run-Stop Relay Circuit Schematic

Run/Stop Relay Circuit

Jim Keith - 03/19/13

Safety is a major concern in a good many motor-driven applications. This is true in industrial applications where [...]

Fritzing Software Download

P. Marian - 02/25/13

Fritzing software is an interesting open-source initiative to support designers, artists, researchers and hobbyists to work creatively with [...]
simple led tester circuit schematic

Simple LED Tester

Jim Keith - 02/04/13

Do not let its extreme simplicity deceive you — this thing is useful! I have made many over [...]
universal wide voltage range led

Wide Voltage Range LED

P. Marian - 01/15/13

LEDs are well-known for their current consumption, and sometimes a resistor is necessary to limit the current at [...]
lead acid car battery

Top 10 Car Battery Maintenance Tips

P. Marian - 12/28/12

Here are some car battery maintenance tips that will extend your car battery's life. Check out the top [...]
Single Pushbutton Run-Stop Circuit Schematic

Single Pushbutton Run-Stop Circuit

Jim Keith - 12/09/12

There are solutions to this problem—mechanical (push On/push Off switch), electromagnetic (latching relay) and electronic (CMOS logic), but [...]

Greenhouse Heater Temperature Control

Jim Keith - 11/30/12

Standard resistance heaters used for space heaters sometimes have thermostats, but these are not adjustable to the low [...]
Cheapest Power Relay at DigiKey

Relay Driver

Jim Keith - 11/21/12

Relays have been around for a long time and though often now replaced with solid state switches, they [...]
test devices

In-Circuit Testing of Diodes and Rectifiers

Jim Keith - 10/14/12

We have all had difficulty testing diodes in-circuit. Most DMM’s have a diode Vf function that measures forward [...]
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