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| Page last updated on:
Sunday, January 8, 2012
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SPEECH PREAMPLIFIER COMPRESSOR
Component List |
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| Resistors |
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Capacitors |
| R1= trimmer 500 K |
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C1= 2.5 Mf 16v elect. |
| R2= 100 K. |
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C2= 100 Pf |
| R3= 1 M. |
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C3, C5, C11= 5 Mf. 64v elect. |
| R4= 2,2 M. |
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C4= 100.000 Pf. |
| R5= 27 K. |
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C6= 47.000 Pf. |
| R6= 120 K. |
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C7= 27 Pf. |
| R7= 47 Ohm. |
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C8= 1 Mf. 40v elect. |
| R8= 47 K. |
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C9= 4,7 Mf 16v elect. |
| R9= 2,2 M. |
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C10= 100.000 Pf. |
| R10= 270 Ohm. |
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| R11= trimmer 100 K. |
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Transistors |
| R12= 22 K |
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TR1= 2N3820 |
| R13= trimmer 50 K. |
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TR2 TR3= 2N1711 MC140 |
| R14= 100 K |
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| R15= 470 K |
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Diodes |
| R16= Pot. lin. 50 K. |
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D1 D2= 1N914 1N4148 |
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ICs |
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IC1= LM387 |
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This preamp has high gain, but should have a flat response 300-3K..
73 De John, G8MNY @ GB7CIP
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