Sensitive triac controller (CB7864E)

This circuit, which can be used as a shield, was found in a 90s Electronic Design. The circuit uses a diac and the transistor can be general-purpose.

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Small Motor Protection and Control Circuit (CB5404E)
We find this circuit in a 2005 Linear Technology manual. The circuit applies to small DC motors...
DC Motor Digital Inverter (CB18010E)
This circuit, which can also be adapted to function as a microcontroller shield, is from 2003...
Sonic or vox relay (CB22000E)
Using a CA3130, operational amplifier with FET, we found this circuit in a 1977 publication. The...