Found in American documentation from the 90's, this circuit oscillates up to 150 MHz. The transistor supports an equivalent and the diode is general-purpose.
Found in a 90s Popular Electronics, this circuit is interspersed between the filter and the...
This circuit is from an 80's documentation. The integrated circuit is from the time and the...
This circuit was found in a 80s American documentation. The zener diodes determine the points of...