Regenerative detector (CB20559E)

This circuit for a receiver was found in an English documentation from 1963.

The transistor is made of germanium. No information was given about the coils.

Variable Frequency Ring Oscillator (CIR113E)
An way to change the frequency of the previous oscillator (CIR112E) is to add a variable capacitor in the...
Latched TTL Switch (CB1474E)
We found this circuit in a 1975 radio amateur documentation. The circuit uses TTL technology and...
1 to 1 Astable Using the 555 (CB863E)
An stable multivibrator with 50% of duty cucle can be mounted using the 555 as shown by the...