Category Archives: Control Electronics

LM412 Sample and Hold

Posted on November 15, 2010 by Rend

This is a LM412 sample and hold circuit. This circuit uses discrete components. This circuit also uses MPF102 JFET transistor and LM412 dual op-amps. The source is prevented to charge the capacitor by the MPF102. The LM412 is used because … Continue reading →

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LM2907 Motor Speed Control – Part 1

Posted on October 29, 2010 by Rust

We can purchase DC motors with or without brushes with ac tachometer outputs already provided by the manufacturer. A very low cost speed control can be constructed with these motors in combination with the LM2907. The most simple version is … Continue reading →

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LM2907 Motor Speed Control – Part 2

Posted on October 29, 2010 by Rust

The following figure show us an alternative approach which gives proportional control. The charge pump integrator is shown in a feedback connection around the operational amplifier. For zero speed, the output voltage is equal to the reference voltage set up … Continue reading →

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