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| Page last updated on:
Friday, January 6, 2012
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Mic Preamp
The microphone below I made and have used now for around 15 years. It has lots of gain and a very small current drain, the 1.5V battery will last for over a year with daily use.
Pre-Amp Microphone
Parts List |
| Resistors: |
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| R1,R4 |
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1K |
| R2,R7 |
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100K |
| R3 |
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470ohm |
| R5 |
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10K |
| R6 |
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510ohm |
| RV1 |
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5K lin pot |
| Capacitors: |
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| C1,C4,C7 |
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1mf mini electrolitic capacitor |
| C2 |
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1nf disc capacitor |
| C3,C5,C6 |
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4.7nf disc capacitor |
| Transistors: |
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| T1 |
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BC549C |
| T2 |
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BC559C |
| Other components: |
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| E1 |
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Electret Mic Element |
| SW1 |
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D.P.D.T. Switch |
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MATRIX BOARD LAYOUT
DIAGRAM VIEWED FROM COMPONANT SIDE, COPPER STRIP ON OPPOSITE SIDE
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