Free Simple Circuit Diagram
This is a supply voltage monitor circuit, an indicator to show if the power supply is in good condition. Designed using the IC 555 timer, this circuit will flash the LED1 when the supply voltage surpass preset level. With flashing indicator, at least there will be two benefits, first, the power consumption will be lower since the indicator doesn’t have […]
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As an alternative to bipolar transistor, a lamp flasher can be built by using two power FETs. Like other flasher circuit, this circuit alternately switch the two lamps off and on. It is based on a simple astable multivibrator that formed by the two power FETs. To modify the flashing rate, just remember that flash rate is determined by the […]
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This LED flasher circuit uses 555 IC, and is capable of driving up to 10 LEDs. The good news is, the use of multiple LEDs in series doesn’t increase the power consumption when compared with using only two LEDs. If we use only two LEDs, then we have to sink the power into a current limiter resistor, which dissipate the […]
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To save the complexity of driver circuit, a multiplexer icrcuit can be used for the solution. With this multiplexed BCD decoder, we can use only one BCD decoder to drive 3-digits 7 segment display. Each digit will be activated in sequence, but it will look like that all digits are driven continuously since the sequence is repeated quickly. Here is […]
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