Current shield RS232 (CB8075E)

Found in a Popular Electronics from the 9s, this circuit has output for RS-232 interfaces and current input. The power supply must be symmetrical.

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Digital Wind Indicator (CB26031E)
We found this circuit in an article in Electronics Now magazine from November 1997. The circuit uses...
Low Power Amplifier with Transformer (CB12874E)
This circuit provides just over ½ W to a small speaker. We found this configuration in an old...
SIDAC Relaxation Oscillator (CB4243E)
In the figure we have a typical relaxation oscillator with a SIDAC as well as waveforms and...