A 50VA transformer with a 1A mains fuse fitted !the fuse is rated at 1 amp 250v. I tested first without I/o connected. then I connected the molex connectors to rca's only. no external inputs or outputs were connected. the dcb1 seems to idle happily until I connect the molex output.the transformer is antek 15v 50va.
Hi All,
I have the DCB1 playing music today. Thanks for your help.
The unit on top is my passive preamp/volume control. I decided to copy davym's approach. It sounds incredible. It's my favorite preamp. I could tell that from the first note this afternoon. I would describe it as more three dimensional, if that makes sense. More details are apparent, especially the bass. I can follow every note of the bass guitar now. It was a bit muddier with my other preamps. It replaces a p2p version of the b1. I can tell the psu adds a lot. It is also stone silent when idling. I'm playing it now with an Elliot p3a amp using the Mr. Evil/PMI psu, and I've never experienced a quieter rig. Thanks again, everybody.
I have the DCB1 playing music today. Thanks for your help.
The unit on top is my passive preamp/volume control. I decided to copy davym's approach. It sounds incredible. It's my favorite preamp. I could tell that from the first note this afternoon. I would describe it as more three dimensional, if that makes sense. More details are apparent, especially the bass. I can follow every note of the bass guitar now. It was a bit muddier with my other preamps. It replaces a p2p version of the b1. I can tell the psu adds a lot. It is also stone silent when idling. I'm playing it now with an Elliot p3a amp using the Mr. Evil/PMI psu, and I've never experienced a quieter rig. Thanks again, everybody.
Attachments
Yes. The trade off between isolation versus more connectors and slightly more wire seems to work for me. I'm very happy with results. I'm also surprised that I can feel almost no heat on the bottom of the case where I have the transistors attached. I'm using 50va xformer, 10 ohm/5w resistors, and 3mm thick aluminum plate for bottom of case. I seem to have a lot more margin for hot-rodding. I will report back in a week after more break in. Thanks.
A passive Preamp with 3 knobs is interesting... One for the stepped attenuator and then one of the other two for the source select.. But he has only one input/output on the passive pre...
I don't know if you can get away with a Bass and Treble adjust going passive.... right/left adj or.... possibly dual Attenuators going one per channel. I was wondering too if freeman is running a 25k attenuator or less in the passive... DCB1 Oscillation issues if you go above this I think.
Interesting build!!! Nice!
I don't know if you can get away with a Bass and Treble adjust going passive.... right/left adj or.... possibly dual Attenuators going one per channel. I was wondering too if freeman is running a 25k attenuator or less in the passive... DCB1 Oscillation issues if you go above this I think.
Interesting build!!! Nice!
Yes. I have the Broskie/glassware stepped attenuator with coarse -6db and right/left balance fine -1db controls. I bought the a3 mini. It's 20k. I have only 1 input. I plan to add at least one more and a switch eventually. It works very well for me. I was using a carbon pot in my p2p b1 and decided to give this a try. I really can't comment on improvements due to attenuator alone, but amount of detail and clarity is amazing in the dcb1. Cheers.
If that kit was from me, and sounds like it is,
This was a mistake. PM your address and I will get you a couple bc550s in the mail.
