Precision Crystal Calibrator CIR22334S CB21784E (CB21784E)

We found this circuit in a 1977 radio documentation. The circuit uses TTL frequency dividers from the time.

Vibrato with the 555 (CB17487E)
This circuit was found in a 1986 publication. The speed of the effect is determined by the 555,...
Turntable preamplifier II (CB19173E)
This preamp version uses BC109 transistors that are older versions of the current BC549 in plastic...
VCO 555 (CB9427E)
This simple voltage-controlled oscillator generates signals from 300 Hz to 1,500 Hz with voltages from...