Bass control (CB8722E)

Found in a 1993 Electronics Hobbyst Handbook, this passive circuit can be used with common preamplifiers and amplifiers.

Audio Expander (CB24742E)
Indicated for stereophonic sound applications, this circuit was found in the April 1983 issue of...
Divider by 10 (CB20106E)
This divider by 10 is synchronized because it is implemented based on TTL or CMOS logic according to...
Siren (CB7081E)
This well-known circuit version of the siren was obtained in a Colectro Handbook from the 70s. The...