400 Hz servo amplifier

Posted on Jan 10, 2013

The signal from a synchro receiver or a variable resistive cam follower (potentiometer) is boosted by operational amplifier Ul, whose output swing is limited by back-to-back zeners D3 and D4. The signal is then applied to operational amplifiers U2 and U3, which drive the gates of Ql and Q2 respectively. The npn transistor (Q3) is a fast current limiter for the n-channel MTM8N10; a pnp transistor (Q4) performs the same function for the p-channelMTM8P10. Capacitors C3 and C4 eliminate the need for accurate dc offset zeroing.

400 Hz servo amplifier
Click here to download the full size of the above Circuit.

T1 steps up the output voltage to 120 V for the 400 Hz servo motor.

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