Led Voltage Indicator | Electronic Project Circuits

Posts Tagged ‘led voltage indicator’

Simple Mains Voltage monitor LM324

This Circuit helps in the monitoring of mains supply voltage. It does not use a isolation step down transformer. This has to be constructed only by skilled people with knowledge of safety requirements.

C1 0.47uF can be brought down to 0.22uF for low LED currents, use high efficiency ultra bright LEDs.C1 should be 440V AC or 630V DC plastic axial yellow, polyester, polycarbonate, polypropylene, metalized film.

R3-R6-R9-R14-R18 resistor divider determines the LED turn on or threshold switch points, 10M for hysteresis.
Adjust R16 preset with a log Plastic tweaker to get the led D2 to turn on when input voltage is at 220V AC. This has to be done after PCB is put in a sealed fire-retardant-plastic or epoxy box. drill a hole in box for plastic tweaker.

Be the first to comment - What do you think? Posted by admin - October 5, 2010 at 8:44 am

Categories: LED Flasher, Meter Tags: led voltage indicator, LM324, main voltage monitor

LED Display for On-Off battery indicator

This circuit uses LED – 2 pcs. show something On – Off of or the circuit that use Battery. By LED – D1 flasher , when open and D2 flasher when open. While open that have charge current amount of flow through D1 go to Charge Capacitors 1000 uF , make D1 stick or shine and switch off when Capacitors the full. Then have current which flow be Leakage Current the a little. When enough close capacitors 1000 uF discharge way D2 , then stick tell close or cut the circuit has already. The detail is other , friends see in the circuit yes.

Be the first to comment - What do you think? Posted by admin - November 25, 2008 at 8:09 am

Categories: Battery, Detector, LED Flasher Tags: battery tester, led display, led voltage indicator, power indicator

LED Indicator for remote AC loads

The LED Indicator for remote AC loads Circuit. At very cheap and use electronic part the a little. This circuit uses diode rectifier cheapness , Resistor and LED only. As a result assemble the circuit shows flowwing of AC current Source in load easily. Although intend to design for apply to office implement with main electric , but we may modify this idea goes to are usable with the level low voltage get not difficult please.