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.
This input stage has unit gain but a high input impedance and low output impedance. The circuit is...
This circuit is from old documentation having a gain of approximately 35 dB at 1 kHz with 2.2 mV...
This precision oscillator was found in the October 1992 issue of Radio Electronics magazine. The...