50V Precision Regulator using LM10 IC

This voltage regulator arrangement is unique, since the op-amp is configured not to see either the source voltage or the output voltage directly, making it possible to regulate higher voltage while the IC is only suffering the transistors bias voltage. Here is the schematic diagram of the circuit: You can see in the diagram that the IC’s power supply pin […]

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Scaled +6.6V Reference Using 741 Opamp

To maintain constant current of D1 at 2 mA, this circuit uses combination of negative and positive feedback, unaffected by ambient temperature  variation and unregulated input voltage inconsistency. Reference voltage of 6.6 V is scaled up to give higher  volatage level at output of A1. This reference voltage is determined by breakdown voltage of 1N4611 zener. The scaled output has […]

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Variable Voltage Source is Adjustable Down to Zero!

Variable adjustable voltage source is very important in electronic testing and experiment, no matter whether it’s just for hobby, professional research, or exploring new electronic circuit design. A very low voltage source sometimes is needed, and the following schematic diagram show such circuit,  a 0-5V adjustable voltage source with very good stability: [National Semiconductor Application Note]

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LM10 Negative Regulator

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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