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20 kHz Astable Multivibrator with Transistors CIRCUIT (2N390

2016-05-06 22:21  
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This article describes the 20 kHz Astable Multivibrator with Transistors CIRCUIT (2N3904). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:2N3904.

Astable multivibrator or oscillator circuit is based on positive feedback. We can design such circuit using op-amp, logic gates, or transistors. Here we can rely on single capacitor capacitor and resistor for the feedback inside op-amp like transistor circuit, which works over wide range of temperature, voltages and transistor gains. The stability is pretty good, for supply voltage changes between 6 and 12 V, the frequency will varies only by 0.05%. We can change the frequency/ timing? by changing? R1, R2 and C. The duty cycle? can be modified according to ratio of R3 to R, and the circuit gives 50% for values shown in the schematic diagram.

20 kHz Astable circuit schematic

 


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