Free Simple Circuit Diagram
This is a simple high gain JFET audio amplifier circuit. This circuit need very low power but it provides high gain amplifying function. It also called “JFET µ amp”. Here is the circuit : The lower drain current is, the more gain is obtained because µ of a JFET increases as drain current decreases. However it will sacrifice input dynamic range […]
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This is digital voltage selection control circuit. This circuit uses L200 Regulator. It can be used to regulated the output voltage digitally. Here is the circuit : A combination of P2, R3, R2, and R1 with R5 form voltage divider that determine the output voltage. The transistor is used to switched off this circuit. The output voltage does not exceed […]
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This is a programmable current and voltage regulator circuit. It consist of a voltage regulator with external current limitation. The variable resistor R2 is forced by a constant current because of the fixed voltage of 2.77 V at the terminals of R1. The voltage at pin 2 and the output voltage are varied, if R2 is varied. Here is the […]
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This is ultrasonic proximity detector circuit. This circuit consist of micropower opamp and a pair of matched piezo-ceramic tranducers. It uses a 9V battery as power supply. This circuit uses the radar principle, when the objects or people is nearby it will reflect the transmitter’s steady tone back to the reciever. Here is the circuit : First circuit is a […]
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