Jacob's Ladder (CB21079E)

This circuit was found in American documentation from the 90's. The transformer is of the high voltage type for old light advertisements.

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Locomotive Sound (CB12323E)
This circuit is from 1990 documentation. It can be implemented with BC548 transistors instead of...
Talking Robot (CB16501E)
When you speak into the microphone of this circuit, the sound produced in the speaker resembles a robot...
Linear Ohmmeter (CB13270E)
This circuit uses an operational amplifier that is no longer on the market but can be implemented with a...