This receiver, whose tuning range depends on L1 and L2, was found in the 1992 special edition of Radio Electronics Experimenter. The circuit is relatively simple and has good sensitivity.
The output transistors of this circuit can be TIP31 and TIP32. The other transistors admit...
This oscillator with crystal for overtone operation was found in an old American documentation. The coil...
Old multimeters used a 22.5 V battery for high resistance measurements. If you have one, you...