Free Simple Circuit Diagram
Balance indicator for power supply show if a symmetric power supply is really symmetric or not. With two comparator pairs from a LM339N quad comparator we can make a such indicator. One pair drives the red warn LED3 and the other pair drive the yellow negative(-) and positive (+). The power supply of this circuit is an unregulated voltage. The […]
Read moreOn these two following circuits, we can latch on the SCR (and thereby the lamp) by momentarily closing S1, thereby feeding gate drive to the SC via R1. The gate is tied to the cathode via R2 to improve circuit stability in both circuits. It can be turned off again after the SCR turns on only by temporarily reducing anode […]
Read more
A stable voltage source is needed in many calibration process. Most electronic devices are affected by its surrounding temperature. To control all the components temperature by manipulating the surrounding temperature is not easy, but fortunately we can control only the most critical component to produce a stable voltage. The most critical component in a voltage reference is the reference diode, […]
Read more
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 […]
Read more