Abstract: To improve the reliability of systems which, upon operation of the brake, must be disconnected but otherwise operate reliably, and to reduce the number of components required, a memory and control circuit is provided which includes an amplifier having a self-holding feedback connection. Upon receiving a "disconnect" signal, for example due to operation of the brake of the vehicle, control operation of the circuit is inhibited; upon operation of a "resume" switch, connected to the feedback junction, the self-holding feature of the amplifier in the "disconnect" mode is inhibited so that the circuit can again resume its control function.