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Old 15th November 2011, 05:56 PM   #1081
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How does BOZ-J sound compared to BOZ?
Build them both, and let us know
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Old 15th November 2011, 06:26 PM   #1082
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I have both. There is no comparison. IMHO, BOZ-J is better in every respect, with the probable exception of output capability.
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Old 22nd November 2011, 01:28 PM   #1083
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hmm, I got an inquiry.

I'll be using 2x 9v batteries in series to power the jfet boz for 18v total.

Should I be adding caps to supplement the dc power supply? I'm not sure it's necessary, but I've read where you can add up to 10,000 uf caps to it?

I'm not sure how that helps?
Just curious.
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Old 22nd November 2011, 02:10 PM   #1084
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merlin's question brings something to mind that I have been wondering about - if you put two really big caps (like the 10,000uf he mentions) on the circuit downstream of the batteries, isn't that just going to drain the heck out of the batteries when it's switched on??
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Old 22nd November 2011, 02:46 PM   #1085
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Originally Posted by merlin2069er View Post
hmm, I got an inquiry.

I'll be using 2x 9v batteries in series to power the jfet boz for 18v total.
You're not going to get a whole lot of run time out of a pair of 9V batteries, find yourself some AA battery holders, and run 12 of them instead....

Quote:
Originally Posted by merlin2069er View Post
Should I be adding caps to supplement the dc power supply? I'm not sure it's necessary, but I've read where you can add up to 10,000 uf caps to it?

I'm not sure how that helps?
Just curious.
Not much point adding caps with a battery supply, unless your batteries are some distance from the pre-amp, then they'd help eliminate any noise picked up in the power cabling...

Roscoe
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Old 22nd November 2011, 02:49 PM   #1086
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Don't use a large cap. Try 1000 to 4700 uf. If it's easy enough, see if using a cap will improve bass response. Try it with and without. Can't hurt. What's a battery cost?
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Old 22nd November 2011, 03:35 PM   #1087
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I've got 4700uf caps I'm going to use with the 2x 9v batteries. Mongrel audio guy says he gets about 100hr with them.

I'll build it and find out.
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Old 22nd November 2011, 04:35 PM   #1088
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Merlin2069er,

Let us know if you try it with and without caps; if you hear a difference. I'm curious.

Thanks,

Vince
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Old 22nd November 2011, 05:37 PM   #1089
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ok, will do. I'm just waiting on a few battery holders.

I just got a hammond case, I'll need to drill that out.
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Old 22nd November 2011, 05:45 PM   #1090
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If you are looking for good aluminum cases in the future, check out Antek. They have a link to cases and heat sinks. They sell extra thick front panels too.
And yes, I realize Hammond is in Canada! Case, heat sinks and transformers in one place! That's half the battle right there!
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