For the enclosure, Mark has used a heavy cast aluminum cooking pan and a massive wooden cutting board. The amplifier is based around the LM3875 chip (power opamp) and uses point-to-point wiring. The amplifier follows the "rigid and compact" approach of the 47 Laboratory Gaincard amplifier. A rigid enclosure is used to reduce resonance and vibration while a short signal path, feedback loop and minimal parts (compact) are used to preserve information. The schematic of the three resistor amplifier is shown below.
Keep cooking Mark, as I look forward to more of your projects. See the project page for full details of Mark's Synergy - LM3875 Gainclone Chip Amplifier Project.
Related DIY Gainclone Projects:
- Mark's Nano LM3875 DIY ChipAmp (gainclone)
- Bruce's LM3875 DIY Chip Amplifier (Gainclone) Kit
- Gio's LM3886 DIY Chipamp Project Kit
- Mark's Point to Point LM3875 Gainclone / ChipAmp instructions
- Thomas' TDA2050 Hi-Fi Chip Amplifier (chipamp)
The idea of the chopping board and cooking pan as enclosure is great! might borrow this concept for my passive "pre-amp" if I ever get around to making it.
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