Car Alarm wiring diagrams 2

This low-cost DC supply voltage monitor emits a warning when the voltage drops below a specified threshold. It is particularly suitable for monitoring rechargeable batteries as it consumes only a few microamperes in its idle state. The voltage level...

This transistor-based alarm system includes automatic exit and entry delays, a timed bell cut-off, and a system reset feature. In addition to the exit/entry zone, the basic alarm board is equipped with one instant zone, which is sufficient for...

3-wire door locks can function as either positive or negative systems. There is a constant ground or positive wire that connects to either the lock or unlock wire when the switch is activated. The objective is to integrate relays...

While the normal PC hardware might well run with just Tx, Rx and Ground connected, most driver software will wait forever for one of the handshaking lines to go to the correct level. Depending on the signal state it...

The circuit utilizes four NAND gates from a 4011 package. In each oscillator, one gate functions as a simple inverter, while the other features a control input. The oscillator's operation is disabled when this input is held low. The...

The Keypad must be the kind with a common terminal and a separate connection for each key. On a 12-key pad, look for 13 terminals. The matrix type with 7 terminals will NOT do. The Alarm is set by...