Hi Everyone,
It's been a while since I've been posting on this forum. I thought I might share the schematic and possibly PCB layout of the 'Spartan 10' phonostage, which I designed a couple of years ago and made into a commercial successful product, selling the last one in December 2022. Hopefully this counts as 'DIY' as I did indeed do it myself! Among other features it has...
MF
It's been a while since I've been posting on this forum. I thought I might share the schematic and possibly PCB layout of the 'Spartan 10' phonostage, which I designed a couple of years ago and made into a commercial successful product, selling the last one in December 2022. Hopefully this counts as 'DIY' as I did indeed do it myself! Among other features it has...
- Superb RIAA accuracy to ±0.1dB, absolutely none of the usual colouration found in almost all other phonostages that barely make ±0.5dB or worse
- Spotlessly clean high frequency reproduction, through the use of limited high frequency negative feedback on the uncompensated input amplifiers
- Very low distortion, from double-stage design that shares the amplification between two amplifiers stages
- Low noise input amplifiers, optimised for real moving magnet cartridge impedance characteristics
- Low frequency crossfeed, a unique switchable filter that cancels low frequency noise
- Mono switching for getting the best out of mono pressings
- 3rd order subsonic filtering from 22Hz
- A fully linear split supply with start-up relay muting
MF
