3-tube receiver (T1602E)

Found in a 1949 Radio Electronics, this circuit employs vacuum tubes of the time. Power supply not provided.

Astable sawtooth (CB8944E)
Found in a 1968 American documentation, this circuit generates sawtooth signals whose rise and...
Intermittent Siren 7400 (CB519E)
This TTL siren is formed by two oscillators using each two Gates of a 7400. Frequency or the...
Tone Control CA3140 (CB14794E)
Although it is a circuit from the 80s, it can still be easily implemented today because the...