Oscillator for the medium wave range (CB21140E)

This ground-based circuit was found in 1990s American documentation. The transistor can be any general-purpose equivalent.

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Digital thermometer (CB9486E)
This 3 and-a-half digit circuit was found in a Teledyne documentation from the 90s. The circuit uses...
555 Code Oscillator (CB26324E)
Found in a 1990s Popular Electronics, this circuit produces a tone on a small speaker. The keyer...
Alarm with series sensors (CB6417E)
This series sensor circuit is from 1995 Popular Electronics. The circuit can use any SCR and the...