e find this circuit in documentation for radio amateurs of 1974. The unijunction transistor can be the 2N2646 and the NPN transistor a BD135. The power supply can be made with voltages from 9 to 12 V. The tone is set in the potentiometer.
e find this circuit in documentation for radio amateurs of 1974. The unijunction transistor can be the 2N2646 and the NPN transistor a BD135. The power supply can be made with voltages from 9 to 12 V. The tone is set in the potentiometer.
