In this circuit, which uses only diodes, we have both simultaneous functions. The diodes are general-purpose types and the resistors have typical values of 2k2.
Using junction FETs, a configurable configuration is achieved for very low frequencies. FETs can...
Found in an Elektor from the 90s, this circuit converts signals from the 280 kHz band to 516 kHz,...
We found this circuit in a 1976 publication. The transistors can be BC547 or 2N2222. Crystals up...