Simple Transistor Pulse Generator Circuit Sometimes it is necessary to create a short pulse of a defined length from an incoming digital or logic waveform. It is very easy to create a simple pulse generator circuit design using just two transistors and a handful of other electronic components. Although the design is not as sophisticated as some may be, it suits very well for a number of uses, and it uses one transistor and only a few other electronic components. This simple circuit design gives a negative going pulse from a positive going input - this may be suitable for some applications, and it has the advantages of great simplicity. This basic pulse generator circuit uses a differentiator to provide the pulse and then it uses a transistor to provide the pulses switching between virtually the rail voltage and 0V, while inverting the pulse. For this circuit, typically the value of R2 » R1. Also the pulse width will be of the order of τ = R2 C. It should be remembered that a circuit like this will be a little unpredictable in terms of the actual time for the pulse. A transistor pulse generator like this will offer satisfactory levels of performance for some applications, but not where a high level of performance is needed. Against, this, the transistor based pulse generator circuit is very easy to realise.