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.
We found this sensitive moisture detector in an old documentation. The circuit uses a common JFET,...
This circuit, with the assembly in a contact matrix, was found in a publication from the 90s. The...
This modulator circuit for transmitters was found in American documentation from 1964. It can be...