Found in a 90’s Popular Electronics, this circuit generates sinusoidal signals with frequency controlled by an input signal. C4, C3 and C1 together with R12 and R3 determine the frequency generated.
The transistor of this circuit found in an old American documentation can be the BC548 for T1 and...
This circuit was found in Motorola documentation from 1969. The transistors are from that time. The...
The crystal in this circuit can have frequencies from 100kHz to 8MHz. Capacitor C2 adjusts the...