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SI is an external key switch. The alarm allows a delay of 0 to 45 seconds after SI is operated before the circuit is armed. During this period, LED1 lights up green. After this delay, LED1 lights red, indicating...
The LM317 is an adjustable, positive 3-terminal voltage regulator capable of supplying 100 mA (for RA87U control) or 1.5 A (for Order Code UF27E and N61CA) across an output voltage range of 1.2 V to 37 V. These voltage...
The IN4148 series diode is connected in the V+ line and configured in a loop to prevent damage from reverse voltage conditions. The diode exhibits a forward voltage drop of approximately 0.7V, which affects the supply voltage. The circuit...
The simple circuit below regulates the voltage from a 6V solar panel to a fixed +5V. This voltage can be supplied to any cell phone or USB-connected portable device to charge its battery. The circuit utilizes a Reg113-5 voltage...
This simple alarm circuit utilizes a single integrated circuit (IC) and a driver transistor, allowing the use of either normally open (NO) or normally closed (NC) sensors. When a sensor is triggered, the input to U1A transitions to a...
This is a power-on time delay relay circuit that utilizes the emitter/base breakdown voltage of a standard bipolar transistor. The reverse-connected emitter/base junction of a 2N3904 transistor functions as an 8-volt zener diode, establishing a higher turn-on voltage for...
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