11/13/2023 0 Comments Bipolar transistor cookbook![]() ![]() ASTABLE MULTIVIBRATOR BASICSįigure 1 shows the circuit and generated waveforms of a simple 1 kHz astable multivibrator, in which the two transistors are cross-coupled (from collector to base) via timer networks C1-R1 and C2-R2. Lastly, the Schmitt has two stable input-voltage-sensitive states and is useful as a sine-to-square waveform converter or threshold switch. The bistable has two stable states and is useful as a triggered stop/go or high/low waveform generator. The monostable has one stable and one quasi-stable state and is useful as a triggered pulse generator. Of these four, the astable has two quasi-stable states and is useful as a free-running square wave generator. There are four basic types of multivibrator (multi) circuits, and they are all useful in waveform generating applications. Multivibrators are two-state (output high or output low) circuits that can be switched between one state and the other via a suitable trigger signal, which may be generated either internally or externally. This time, we describe ways of using bipolars to make practical multivibrator types of waveform generator circuits. ![]() ![]() Our last installment covered practical circuits of the oscillator type. The two most widely used types of transistor waveform generator circuits are the oscillator types that produce sine waves and use transistors as linear amplifying elements, and the multivibrator types that generate square or rectangular waveforms and use transistors as digital switching elements. ![]()
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