Analog Frequency Meter Circuit using NE555
This 1-kHz linear-scale analog frequency meter circuit uses the 555 as a pulse counter.
| PARTS LIST | |
| R1 | 4.7kΩ |
| R2 | 4.7kΩ |
| R3 | 10kΩ |
| R4 | 22kΩ |
| R5 | 4.7kΩ |
| R6 | 2.7kΩ |
| VR1 | 50kΩ |
| VR2 | 2.5kΩ |
| C1 | 0.001µF |
| C2 | 0.01µF |
| C3 | 10pF |
| D1 | 1N4148 |
| Q1 | 2N3904 |
| IC1 | NE555 |
| IC2 | LM7805 |
| M1 | 1mA meter |
2N3904 NPN General Purpose Amplifier
VR1 Adjust for 1kHz full scale reading.
Frequency is read on M1, (or 1mA meter) which can be calibrated to read 0 to 1 kHz.
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