Flat response amplifier CIR16474S CB9390E (CB9390E)

This circuit was found in a 1970s documentation. The integrated circuit used is uncommon today.

Intermittent Siren 7400 (CB519E)
This TTL siren is formed by two oscillators using each two Gates of a 7400. Frequency or the...
Automotive Tachometer (CB12605E)
This circuit is from a 1978 publication, being connected to the contact breaker of cars that still...
Fence Electrifier (CB5028E)
This circuit was found in a Radio Escuela Gráfica magazine from Argentina published in the 70's....