This circuit generates short pulses. The transistor can be a 2N2222 or BC548 and the frequency is given by the resistors and the capacitor that can be changed.
We found this circuit in an Argentine publication from 1973. The original transistor is made of...
Taking advantage of the comparator setting, we can use the Norton amplifier as an over temperature...
The difference between this oscillator in relation to the previous one is in the use of source...