article · English
The TELEFUNKEN RA 741 Analog Computer
A first-person restoration account of a TELEFUNKEN RA 741 analog computer, originally rescued from the University of Aachen. The article details repair of the power supply (including the ±10 V precision reference regulators and the 400 Hz chopper/synchronous-rectifier system), the 15 Germanium auto-zero operational amplifiers (including substitution of OPA27 ICs for failed Germanium circuits), the timing/control relay section, and the removable patch panel. Dated February 2006 / January 2008 and attributed via contact email to [email protected].
restorationoperational amplifiersauto-zero amplifierschopper stabilization