Stereo preamplifier TDA3410 (CB21937E)

Taken from the 1982 SGS manual on integrated circuits, this preamplifier was used in commercial equipment at the time.

Digital PLL (CB5290E)
We find this circuit in a 1976 NASA handbook. The circuit can be designed based on current logical...
Manual Siren (CB13035E)
In the circuit shown in the figure when we press S1, capacitor C1 charges slowly, and with that it...
4 W Amplifier (CB6281E)
This circuit is from a 1968 Motorola power circuit manual. The circuit uses transistors of the...