Free Simple Circuit Diagram
Ideally, any testing equipment will not draw any current from the device under test. This ideal condition can be approximated by designing a testing device with a very high input impedance for negligible loading, and this Darlington logic probe circuit could be one of this. This circuit uses two transistor in Darlington configuration. The connection of transistor will give very […]
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It is possible to build a negative regulator using LM10 comparator and voltage reference IC. A transistor is employed to shift the reference current, increasing the minimum operating voltage to approximately 1.8V. The transistor should has high gain for better thermal stability, for example, gain = 100 will cause 1% drift over -55 to 125 °C temperature range. The gain […]
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This circuit is a ultra low noise magnetic phono preamp. This circuit uses an LM381/1A. This circuit also includes RIAA equalization. This circuit has ultra low noise. The DC voltage level at the output of this circuit is about 16.5V, the voltage must be equal to half of the supply voltage. That can be done by adjusting potentiometer R7. Here […]
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Shunt regulator is equivalent with zener diode regulator, where you can connect the circuit in series with a resistor and tap the output at the junction. With LM10, we can build more stable regulator (compared to zener diode version). Here is the schematic diagram of the circuit: The nominal voltage of the circuit is the internal voltage reference multiplied by […]
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