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STD 555 timer frequency divider

License: Public Domain

Mode: Editors' pick

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Update time: 2021-02-19 13:48:02
Creation time: 2021-02-19 13:05:34
Description

How to use a transistor or diode charge pump and a 555 timer to make a variable ratio frequncy divider. 

 

By adjusting the voltage on the CV pin, the divider raio can be changed.

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ID Name Designator Quantity
1 2.2n C2 1
2 1n C1,C3,C4 3
3 1N4148 D1,D3,D2 3
4 {VCC} V1 1
5 {CV} V3 1
6 555_BJT_EE U1,U2 2
7 PULSE(0 5 0 1u 1u 499u 1m) V2 1
8 100k R1,R2 2
9 2N2222 Q1 1

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