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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European Emergency Siren 555 (CB25520E)
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This configuration with FET and Unijunction can be found elsewhere on this site. The JFET admits...
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We found this circuit in a Popular Electronics from the 90s. It operates at a frequency of 15 kHz....