We found this circuit in an old Mullard (Philips) documentation on the 555 and 556 integrated circuit (double 555). The relay must be 12 V with contacts that support the horn current.
We found this alarm in a 1992 documentation. The circuit has several timings and the relay can...
This transmitter is modulates a infrared light source from an audio signal. Applications include a...
We found this configuration in an integrated circuits manual. The transistor, which can be of any...