Zaubertuba
100+ Head-Fier
- Joined
- Feb 3, 2009
- Posts
- 449
- Likes
- 23
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Sheesh Steve, you've been such an awesome mentor through this whole thing--I probably can cut you a little slack.
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Double *Doh!* ...duly noted.
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Good point about also running single-ended. That's a key criteria in my design so I'll probably start out with 2x (total 4x double-ended) gain.
Question for both of you (and anyone else for that matter). Am I correct in assuming that adding the gain will throw all the documented test voltages out of whack? If so, how will I test it when I build? The same question could be asked about biasing the boards, I think.
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I think I'm pretty thrifty--though hacking together your own regulator like that has me beat.
I'm already planning on using some existing broken stereo components to help case my builds. $100 for an Opus sounds pretty awesome!
And I was thinking about a balanced Bijou, so if I stick to that it'll be a little pricier, but again, that's down the road a bit.
Originally Posted by Koyaan I. Sqatsi /img/forum/go_quote.gif ****. Sorry. I got the EMail notification for this but had something else going on at the time and forgot to get back over here to reply. |
Sheesh Steve, you've been such an awesome mentor through this whole thing--I probably can cut you a little slack.
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Looks fine, but you still need to change the ground symbols on the XLR pin 1's and the ground loop breaker to chassis grounds. |
Double *Doh!* ...duly noted.
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Originally Posted by mugdecoffee /img/forum/go_quote.gif My original plans were to add 2x gain with the feedback resistor hack but I started out with just the default buffer configuration. It drives my k240s (600ohms) to a louder listening level for most things and a normal listening level for quieter thigns. My k701s got very loud, beyond listening levels for sure but not absolutely painful. I think when I get this cased up I'll end up adding some gain for headroom and also in case I run single ended headphones out of it. |
Good point about also running single-ended. That's a key criteria in my design so I'll probably start out with 2x (total 4x double-ended) gain.
Question for both of you (and anyone else for that matter). Am I correct in assuming that adding the gain will throw all the documented test voltages out of whack? If so, how will I test it when I build? The same question could be asked about biasing the boards, I think.
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For the PSU regulator, I was going to use a couple of 7815 regulators on a piece of perfboard which shouldn't cost more than about $5 all together. You seem like a pretty thrifty diyer which I like to think of myself as. The Opus I have only cost around $100 with only USB input. I saved money by buying the bare boards and parts separately and by making a simple 317 regulator on perfboard. My bijou cost well under $250 before I started upgrading it by just repurposing an old tape player enclosure. Basically, there are plenty of ways to cut corners. |
I think I'm pretty thrifty--though hacking together your own regulator like that has me beat.
And I was thinking about a balanced Bijou, so if I stick to that it'll be a little pricier, but again, that's down the road a bit.