This circuit was found in a documentation from 1948. There are 5 valves with push-pull output. The source uses a transformer, and the indicated application is with turntables.
This circuit is from 1968 documentation. We can assemble it with more modern components such as a...
The frequency ranges that this receiver can tune in depend only on the coils. For medium waves L1...
Found in documentation from the 1970s, this reducing regulator uses integrated circuits and...