BOM component list for additional electrets microphone circuit marked at PCB with extension “Z”
| Qty | Designation | Part | Description | Picture |
| R1Z, R2Z, R6Z | 3.3K |
R1Z, * Mic premp fix: add 1nF capacitor in parallel to R1Z (bottom side of PCB) orange-orange-black-brown-brown |
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| R3Z | 2.2K | red-red-black-brown-brown |  |
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| R4Z | 100R | brown-black-black-black-brown |  |
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| R5Z | 100K | brown-black-black-orange-brown |  |
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| R7Z | 10K | brown-black-black-red-brown |  |
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| C1Z | 1nF (USM) | 102J |  |
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| C2Z | 10uF/25V ILI 35V |  |
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| C6Z | 10uF/25V NP (non-polarized electrolytic) |  |
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| C3Z | 100nF | 104 |  |
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| C4Z, C5Z | 100uF/25V |  |
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| C7Z** | 680pF added from bottom side parallel to R1Z | 681k |  |
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| IC1Z | NE5532P(NE5532AN) |  |
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| KS1Z | JUMPER 2PIN | |||
| LED1z | LED DIODE 3mm GREEN |  |
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| KP6, KP7 | 3,5mm AUDIO JACK PCB MOUNT |  |
