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 MOSFET amplifier operating in the VHF range was found in an old American telecommunications...
We found this circuit in a 1995 publication. It makes use of infrared LEDs of the type existing at...
We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the...