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 filter was obtained from the Texas Instruments Linear Circuits Applications. It makes use of...
In the figure we show a simple way to use a zener diode to protect a load against overvoltage. The...
This circuit can be used on a 0 to 14 V source with a current of 1 A. The PNP power transistor can be the...