Based on the Linear Technology LTC2054, this -48 V circuit was found in a 2005 manual. The circuit is powered with 5 V and can be used as a shield.
We find this TTL configuration in a 1978s documentation. The circuit generates variable pulses...
This 3-channel sequential circuit, but which can be expanded further, uses triacs to drive...
This traditional configuration of integrator with the operational 741 was found in an old American...