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.
This digital / analog converter shield is suggested by MOTOROLA and is based on an operational amplifier...
This circuit is from old documentation and can be assembled with 2N2646 for the unijunction and...
This three-transistor amplifier uses a JFET at the input to increase the input impedance. The...