B1 Buffer Preamp

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#2,129
too bad you didn't ask earlier. I would have thrown them in the bag of resistors I mailed you. Do you have any caps laying around? I know the values aren't too critical, and I think you can eliminate one or more from the circuit depending on your supply...confirm this with others.
 
#2,130
chrismercurio said:
too bad you didn't ask earlier. I would have thrown them in the bag of resistors I mailed you. Do you have any caps laying around? I know the values aren't too critical, and I think you can eliminate one or more from the circuit depending on your supply...confirm this with others.
Click to expand...

I'd have to look around. I got a nice Laptop 19V psu i'm going to try out, it should be here soon, ill put it on the scope and see how clean the DC output it, and maybe com pair it with a set of 6v-18v batteries.

How's your wire 🙂 You like it ?
I also ordered a cheaper set of the 10uf caps, nothing special, but i have been told these are critical, for now ill use them till i can afford a decent pair of good 10uf caps, the 1uf caps i bought these,

Wima MKP4 1.0uF@250V Capacitors – Lot of 5pcs - NOS - eBay (item 280436636815 end time Feb-07-10 21:00:02 PST)
and these for the 10uf,

2,AudioPhiler 400V 10uf Tubular Axial Audio Capacitor - eBay (item 220528559587 end time Dec-24-09 18:02:16 PST)

yes they are cheap, 🙂 for now they will work. I plan to buy a few sets of different types prices and brands to listen and hear the differences my self.

J'
 
#2,131
Whew! Just finished the whole thread.
I have just one question. (so far)
If the circuit is already being fed DC why the electrolytics and why so large?
They're just filtering noise at this point, right?

I've got a couple 2200u BG FKs left over but I'd rather save them for something else if its not going to make all that much difference.
 
#2,135
B1 cross talking between the two sources

Hi, I'm new to this thread but read it all. I built a B1 buffer and I'm very happy with it. I have one problem though. I built it with a switch to select between two sources. With only on source used, if I switch to the second input (which does not have any source attached to it) and increase the volume really high, I can still hear the source from the other input (very attenuated but still audible). In other words, it looks like the switch does not cut off entirely when selecting the inputs. I tried to disconnect the second input, and still can hear the switch to source 2. Thought it could be some short, but don't seem to find any. Any advise? thank you very much for any help
 
#2,139
No, if you have the second input connected, then you don't need the shorting wire. I didn't even get as far as a second set of RCAs, since I don't need a second input; but I didn't solder the shorting wire into place, either, because I'm too lazy. I just took a short piece of wire and looped it through. But if you do have the second set of RCAs, then you can make a simple shorting plug by taking any cheap RCA cable, like what might come with a DVD player, stripping it, and then tying the source to ground. Two of these make perfectly shorts. They also make great shorts for the digital output of a CD player.
 
#2,140
rgheck said:
No, if you have the second input connected, then you don't need the shorting wire. I didn't even get as far as a second set of RCAs, since I don't need a second input; but I didn't solder the shorting wire into place, either, because I'm too lazy. I just took a short piece of wire and looped it through. But if you do have the second set of RCAs, then you can make a simple shorting plug by taking any cheap RCA cable, like what might come with a DVD player, stripping it, and then tying the source to ground. Two of these make perfectly shorts. They also make great shorts for the digital output of a CD player.
Click to expand...

i understand, i thought you could hear source 2 through input 1 when there was no signal with input 1
 
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