This is the typical circuit of a local oscillator for a superheterodyne FM receiver. The circuit was found in a 1980s documentation and is typical of early and early receivers.
This circuit was obtained from a 1965 magazine, but can still be assembled if we use a modern 6 V...
This circuit converts the 12 to 13.6 V of a battery into 6 Vwith current up to 1 A. We can use it...
The HA2620 integrated circuit used in this comparator is from the 80's, but the setting can be...