We found this circuit in a 1998 publication. The circuit has controls for both frequency and signal strength. A lamp is used to monitor the signals. The supply is made with a voltage of 12 V.
This circuit uses a JFET, which may be of the type BF244 or BF245 and a PNP bipolar that may be...
This project was found in a 1982 documentation. Super-regenerative receivers can combine great...
Using two transistors, the resting current for this alarm is 25uA. The circuit was found in an...