Found in American documentation from 1968, this circuit uses both diodes and a neon lamp to generate a 4-step ladder. Observe the signal voltage.
The cut-off frequency of the filter shown in the figure can be adjusted to values between...
This circuit was found in a Popular Electronics from the 90s. The components used are all common...
This circuit uses a dual floodgate MOSFET not very easy to obtain today. Its handling is very...