Pazzy

24v DC is a very popular voltage used in industrial settings. This hobby circuit below was designed to accept four different 24v DC alarm input signals, which are then used to drive a single low power beeper. The beeper is a magnetic type with its own oscillator/driver. The four diodes form an “OR” gate so any one of the four inputs will cause the beeper to make noise. A CMOS version of the popular 555 timer is used to strobe the beeper on and off at about 1Hz.   Copyright: Discover Circuits

This circuit is very common to see trucks or collective where batteries provide 24V and at various points of the electrical circuit required 12V . While many installers take a wire from the junction of the two 12V batteries to afford this is not recommended because in this way is affecting the proper performance of batteries and being downloaded more one than the other with attendant problems this may cause .  DC-DC Converter 24V to 12V / 20A Circuit Diagram As shown, the circuit is nothing but an integrated adjustable voltage regulator which is acting on a group of power transistors in parallel. These transistors do the heavy lifting so to speak while the controller is responsible for controlling them. Where is the 24v connector is the input from the batteries . 12v connector is the output and Gnd connector must be grounded. Of course , all components (transistors and integrated ) with good heat dissipation and electrically isolated from the metal. Adjust: Place the 10K preset max...