Category Archives: Control Electronics

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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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Permanent Split Capacitor (Capacitor Run) AC Induction Motor

A permanent split capacitor (PSC) motor has a run type capacitor. This capacitor is permanently connected in series with the start winding. This will cause the start winding an auxiliary winding once the motor reached the running speed. It cannot … Continue reading

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Capacitor Start AC Induction Motor

Modified split-phase motor with a capacitor in series with the start winding to provide a start “boost” is shown below. The capacitor start motor also has a centrifugal switch like the split-phase motor which disconnects the start winding and the … Continue reading

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FET Switch: A Voltage-Controlled Analog Switch

This is a JFET switch circuit.This circuit uses a MPF102 JFET transistor. In this circuit, the JFET is symmetrical, so the input can be source or drain. The MPF102 is used because this transistor has gate’s reverse breakdown voltage of … Continue reading

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220V Touch Switch

This is a 220V Touch Switch circuit. This circuit is used as switch which turn off and turn on the the electronic device that is connected to the 220V home electrical installations. Here is the schematic diagram of the circuit: … Continue reading

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