Ring Counter with Timing (CB6613E)

This variable timing circuit was found in 1964 General Electric documentation. Circuit uses PUTs that are uncommon components today.

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Square Oscillator LM3900 (CB17389E)
This configuration can be found in other articles in this section. This was obtained in a 2000...
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This gas sensor circuit was found in July 1976 Radio Electronics magazine. The TGS sensor was a...
Commercial Radio 6TR 127 (CB18355E)
This Japanese radio is from the 60s, presenting excellent sensitivity and an output power of 100mW...