The Armstrong super-regenerative circuit
A 1922 technical pamphlet by George Jacob Eltz, issued in New York by the Radio Directory and Publishing Company for amateur radio builders working with Armstrong's super-regenerative receiver. The plates are numbered line schematics in heavy black on cream stock: coiled inductors, variable and fixed capacitors, zigzag resistors, circled triode tubes with hairpin filaments, battery stacks and arrowed callouts, usable as diagram motifs, coil patterns and component symbol sets.
