This circuit uses sunrise and sunset as a synchronization signal. The circuit is from Electronics Now magazine from May 1999. The cycle is one pulse per week.
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...