For purely aesthetic reasons1, not for heat dissipation, I am contemplating using MCPCBs for these two applications:
- Audio frequency circuits, such as a Baby 8 sequencer, Atari Punk console, synthesizer filters, audio effects, etc., and;
- MCU circuits, such as so called "barebones" Arduino projects, where an ATmega328P-PU is employed, and a clock frequency of 8-20 MHz is used.
Would I encounter any adverse effects (capacitive or otherwise) due to the higher frequency ranges used (when compared to DC, or 50 Hz AC, high power LED applications)? I initially assumed that the metal substrate would act as a PCB wide ground plane, and therefore not cause any problems. However, after thinking about it a bit, I am not so sure.
I have seen MCPCB applications for audio amplifiers, so I assume that, for the former, there aren't any issues. For the MCU applications, would the several orders of magnitude higher frequency of the crystal/clock be an issue?
FWIW, the metal substrate would be of the thicker variety, 3.2 mm or higher, ideally 5 - 10 mm. MCPCB dimensions would be limited to a maximum of 120 x 500 mm, but typically 100 x 200 (or less) mm.
Here is an example of an MCPCB used for an LED:
1 For live performance of Chiptunes, ByteBeat, and the such like.