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STD Idea to build simple frequency meter from old calculator
License: GPL 3.0
Mode: Editors' pick
- 0
Update time：
2021-04-11 14:46:14
Creation time：
2017-12-05 13:26:34
Description
This circuit uses a simple idea is the calculator count a frequency within the range 1 second.
This time base is generated by IC-555, on astable multivibrator form. Read more :
[**Idea to build simple frequency meter from old calculator**](https://www.eleccircuit.com/Idea-to-build-simple-frequency-meter-from-old-calculator/)
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 2SC1815 | Q1 | TO-92(TO-92-3) | 1 |
| 2 | 2N2222 | Q2 | TO-92(TO-92-3) | 1 |
| 3 | 555 | U1 | DIP8 | 1 |
| 4 | 1K | R1 | AXIAL-0.3 | 1 |
| 5 | 1M | VR1 | RES-ADJ_3386P | 1 |
| 6 | Header-Male-2.54_1x1 | INPUT,+9VDC | HDR-1X1/2.54 | 2 |
| 7 | 1uF/16V | C1 | CAP-TAN-S2.5 | 1 |
| 8 | 0.01uF | C2 | RAD-0.1 | 1 |
| 9 | DUAL_SWITCH_INV | S1 | NONE | 1 |
| 10 | TERMINAL | J1 | TERMINAL_BLOCK_2P_5 | 1 |
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