Category Archives: Power Supply

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MAX1703 Single-Cell Boost Converter Circuit

When you design a circuit with only a single-cell battery, you will need boost-converter to provide enough voltage for most ...

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55MHz Scope Sensitivity Amplifier

Scope sensitivity amplifier is a vital front-end signal processing for every scope instruments. The function of this circuitry is simple: ...

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Two-Band Bxandall Active Tone Control

Using active circuit for tone control means that we can provide cut and boost, maintaining overall amplifying factor of original ...

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Pulse Width (PWM) Controller Circuit

A LM3900 quad operational amplifier can be used to build a pulse width (PWM) controller. The LM3900 was chosen because ...

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Small TV Modulator Using A Motorola MC1374

How can television modulator be small and simple like this? First, it uses integrated circuit, and the second, any TV ...

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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. … Continue reading

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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 … Continue reading

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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 … Continue reading

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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 … Continue reading

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