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STD 555 timer frequency divider
License: Public Domain
Mode: Editors' pick
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.
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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