Low voltage motor control (CB22121E)

This circuit with SCR was found in an old documentation. The SCR can be the TIC106, and the transformer has a secondary according to the motor.

Level Indicator (CB1546E )
The operational amplifier can be of any type in this circuit, found in a 1974 publication. The...
High Speed Crowbar (CB8357E)
Found in a 1967 General Electric SCR manual, this circuit triggers in case of excess current,...
Cascading 741 (CB13431E)
With this configuration it is possible to obtain an 80 dB gain from two 741 operational...