We found this circuit in an old Popular Electronics. The circuit is experimental, driving an LED from signals applied to the LDRs. The power supply does not have to be symmetrical.
Found in a publication from the 60's, this circuit uses the CK722, germanium transistor of the...
From an input signal, and using an unusual current source, this circuit generates a ramp, that is, a...
With this timer we can start between 30 seconds and one and a half seconds, time set in the pot....