Indicated for checking the operation of small FM transmitters, this circuit was found in an Australian publication from 1991. The components are all common nowadays.
This circuit was obtained from a Popular Electronics of the 90s. The SCR is of any type and the...
This is the receiver circuit for the CB13978B, found in the same 1977 Elettronica Prática...
This circuit can be connected to the output of alarms or sirens with the 555, CMOS or TTL,...