I meant, I didn't do the circuit myself. It was an assembled board, as per the UPC1237 Datasheet, without the "Overload protection" pin being used for anything, only the offset detection.
You use the DC from the main PSU. A dropping resistor and a cap form the Turn-on constant. The board I got delays the speakers with about 3 sec. on turn on.
It's got an 'AC-gone' detection as well. If you use it, you drag a wire from the transformer to the circuit, via a half-wave rectifier. This way,on turn off, it disconnects the speakers immediately. If you don't want to use that, just wire that pin to DC+ as well.
Of course, there are numerous configurations possible. We have quite a few threads here that discus that IC, so there should be enough info for anyone.
It's got an 'AC-gone' detection as well. If you use it, you drag a wire from the transformer to the circuit, via a half-wave rectifier. This way,on turn off, it disconnects the speakers immediately. If you don't want to use that, just wire that pin to DC+ as well.
Of course, there are numerous configurations possible. We have quite a few threads here that discus that IC, so there should be enough info for anyone.
Dear Salas,
You mentioned this a number of times. I have always been fascinated by the concept of "voicing". Could you give some details about the process ?
Thanks,
Davide
Its a subjective touch after all technical is in order. Got to know your system and trust yourself. What kind of distortion profile, some PSU synergy, Iq, voltage point, maybe choice of influential parts values or makes. Keeping notes, trying for coherence in tone. Letting it play for a while, revisiting. Such stuff.
My two cent on the use of the DCB1 with F5: my DCB1 has been connected for 6 month now to my F5, I use it regularly, and never had a problem. Just I am careful on what and how I connect things. I check offset from time to time.
One question that I always wanted to ask: if I want to go balanced, do I really need to have a double PSU, of you think I can use a single psu, considering that mine is pretty high in current.
D.
One question that I always wanted to ask: if I want to go balanced, do I really need to have a double PSU, of you think I can use a single psu, considering that mine is pretty high in current.
D.
This is one the few balanced users remain to reply. I have no personal experience into balanced DCB1.
Hi all,
I have a question about the unmatched k170s. I have a tea-bag's bag of K170s. Keeping the 7-8 ma for B1 and Simplistic RIAA use, I have a lot of 6 and some of 9,10 ma to use.
Is there any preference between them ?
I have a question about the unmatched k170s. I have a tea-bag's bag of K170s. Keeping the 7-8 ma for B1 and Simplistic RIAA use, I have a lot of 6 and some of 9,10 ma to use.
Is there any preference between them ?
i get .5/2.5mv dc does that seem wrong i read under 5mv is ok, .5 seems off the matched quad i bought are 9.15/9.15/9.15/9.13 ? and 10.2/10.7v for power supply anything else to test ?
Are both your output offset voltages a negative value? i.e. did you measure +0.5mVdc or -0.5mVdc? Similarly did you measure +2.5mVdc or -2.5mVdc for the other channel?
good. That tells you that the two jFETs in each pair are the correct way around. The CCS jFET should be the lower Idss. This results in a slight -ve offset.
Would an Antek AS-1215 ( 2x15V, 100VA, 3.3A ) be acceptable for the Mezmerize? Going over the threads I've seen recommendations for anywhere from 12-15V, 30-100VA. I already have one, and was under the impression that only its size would be an issue. Its a bit chunky. This will be my first DIY build so just beginning to learn, needless to say.