Pulse circuit characteristics

1. The transistors in the pulse circuit work in the on-off state. In most cases, the transistor is operating in the saturation or cut-off region of the characteristic curve, so the pulse circuit is sometimes called a switching circuit. From the transistors used, it can also be seen that dedicated switching transistors such as 2AK, 2CK, DK, and 3AK are used when the operating frequency is high, and general transistors are used only when the operating frequency is low.

2. Another feature is that there must be a capacitor (with less inductance) as the key component. The generation of pulses and the transformation of the waveform cannot be separated from the charge and discharge of the capacitor.