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This binary to decimal converter matrix was found in a 1964 General Electric publication. It can be used on modern equivalent circuits, including as a shield.
Crystals from 100 kHz to 1 MHz can be used in this 1957 Raytheon circuit. 4 can have values...
This preamp is from a documentation from the 60s. Of course, transistors are rare today, but the...
The L1 coil consists of 20 to 100 turns of fine wire in a cardboard box where plant specimens are...