These basic bass controls were obtained from an article in Electronics Now magazine in February 1995. They are basic passive circuits in (a) basic tone, (b) boost, (c) cut, and (d) flat response.
This circuit was found in an Electronic Design from the 90s. The integrated circuit is the LT1016, a...
This Wien bridge oscillator was found in a 90's EDN. The components are from that time and the...
This circuit was found in Ferranti's 1974 transistor manual. The circuit source a sawtooth signal to...