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# Supply voltage indicator diagram and principle

2017-08-06 02:15
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This article is to supply voltage indicator diagram and principle. The circuit is very simple, very cheap, but it is very effective. If you want to more thoroughly grasp the principle, you can have an idea of the circuit is the important component, such as: BC337-40 . A novel power supply voltage monitoring the status of LED display which USES a power supply. This simple and slightly odd circuit can clearly show the power supply voltage level (in a larger unit) : as long as the index has good 12 v in the input, LED1 to stable and uninterrupted (naked eye) yellow light. If the input voltage is lower than 11 V, LED1 will start blinking, flashing, will only make more and more slow, if the voltage decline further, give a very clear and visual representation of the status of supply. Flashing will stop, LED1 will finally go out at slightly less than 9 volt. On the other hand, if the input voltage up to 13 V, LED2 will begin to glow, become almost full power at 14 V. The main characteristic of the voltage can be adjusted by adjusting the values of R1 and R4. Base cone-plate electrode of diode T2 is basically just stood a zener diode. The path of the emitter collector reverse polarization and if T1 input voltage high enough - T1 will lead to oscillation frequency, will be proportional to the input voltage. Relaxation oscillator stop cycling when the input voltage are so low, so that it can no longer cause breakdown path along the emitter collector. Not all the small NPN transistor shows that the behavior when reverse polarized in a similar way, but many do. BC337-40 can start oscillating at a relatively low voltage, other types usually need a v or two.