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December 27, 2010
In this circuit, one, two or three neon indicator bulbs can be made to flash in sequence at rates determined by the R and C values. In the single stage circuit, using one lamp, the... [more]
December 27, 2010
This is a basic 555 squarewave oscillator used to produce a 1 Khz tone from an 8 ohm speaker. In the circuit on the left, the speaker is isolated from the oscillator by the NPN... [more]
December 27, 2010
The circuits light a 20 watt lamp when the contacts are touched and the skin resistance is about 2 Megs or less. The circuit on the left uses a power MOSFET which turns on when... [more]
December 27, 2010
Transistor / Diode / IC (DIP) Outlines [more]
December 25, 2010
The ICL7107 is a 3 1/2 digit LED A/D convertor. It contains an internal voltage reference, high isolation analog switches, sequential control logic, and the display drivers. [more]
December 25, 2010
This circuit measures the distance covered during a walk. [more]
December 25, 2010
You can't expect great performance from such a simple detector-based meter. Sensitivity is just adequate enough to get a basic idea of the power that your transmitter is capable of. [more]
December 25, 2010
A simple way to see if a fuse has blown without removing it from its holder. [more]
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