This thread was created to share MF V-dac modifications, be it upgrading the supplied default stock power supply or changing of capacitors and op amp.
The V-dac by itself is pretty good out of the box. However, with a little bit of modifications, the v-dac can be greatly improved.
I wont go into details of how good the v-dac sounds after modification as what sounds good to me may not be the same for others. But one thing for sure, there is great potential in v-dac which can be unleashed.
The cost of the modifications excluding the power supply is only about 10-15% of the cost of v-dac. Components cost such as capacitors and op amp are not that expensive.
I have stopped further modifications as I am pleased with the improvements. My modification list as below is just a guide which I have tried out and I welcome everyone interested to contribute. I wont be posting much here as I will be spending more of my time listening now on
1. Changed default supplied stock wall wart power supply to Meanwell medical power adapter P/N: MES30A-3P1J. Fitted an 2.1mm adaptor bought separately to connect to V-dac.
1. C3 and C4 replaced with same kind of capacitor
2. C25 replaced
3. C45, C22, C61, C41 replaced with same kind of capacitor
4.C58, C50, C27,C29,C36,C32,C38, C30, C18 and C37 replaced with same kind of capacitor
5. C43, C46 replaced with same kind of capacitor
6. C5, C34, C44, C21, C53 and C39 replaced with same kind of capacitor
7. C14 replaced with 47uF capacitor
8. Dual NE5532 opamp changed to LME49860 at location IC7
9. Quad MC33079 opamp changed to LME49740 at location IC5
For C14, I have tried various values at 1uf, 10uF, 47uf and 100uf. 47uf and 1uf sounds better than 10uf and 100uF. Next I tried various sizes of 1uF and 47uf and finally stick with 47uf (blue) which sounds best to me.