MOSFET stepper motor control (CB8575E)

Found in a 90s Popular Electronics, this circuit makes use of power MOSFETs. Equivalent MOSFETs can be used. The circuit acts as a shield.

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Photodiode Amplifier 741 (CB14644E)
The amplifier gain shown in the figure is given by R1. The circuit is valid for other photodiodes and is...
Lamp Driver LM324 (CB15182E)
In the figure we have the way to excite a lamp up to 600 mA with one of the four operating LM324....
15W MOSFET Amplifier (CB1000E)
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