6VDC Amplifier (T485E)

This drum amplifier was found in an American documentation from 1947. It makes use of a mechanical vibrator to generate high voltage for the tubes.

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Optical trigger (CB20692E)
This Schmitt optical trigger with LDR was found in old documentation. The relay must be sensitive, or an...
5 minutes timer 555 (CB25993E)
We found this circuit in the January 1997 Electronics Now magazine. The triac determines the...
Short Wave Micro Transmitter (CB529E)
This transmitter uses a small loudespeaker (FTE) as microphone and can send the signals to...