Model control speed (CB20791E)

Found in old documentation, this circuit uses an SCR like the TIC106 that must be equipped with a heat sink. The motor can be up to 3A.

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Biofeedback 555 (CB24876E)
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Found in a 1967 American electronics magazine, this circuit has an input impedance of 2000 ohms....
MW radio LM3909 (CB14293E)
The circuit presented was obtained in a technical documentation from National Semiconductor. The...