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Folsom DIY7297 Amp & Antipole PSU
Folsom DIY7297 Amp & Antipole PSU
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Old 12th July 2017, 02:24 AM   #11
wcwc is offline wcwc  United States
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1 amp, 1 psu
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Old 12th July 2017, 02:48 AM   #12
Destroyer OS is online now Destroyer OS  United States
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Folsom DIY7297 Amp & Antipole PSU
Quote:
pocomo 2
pistollero 2
jmc207 2
webber 2
wcwc 1
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Old 12th July 2017, 05:06 AM   #13
springnr is offline springnr  United States
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2 amp and 2 psu, thanks
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Old 12th July 2017, 05:12 AM   #14
Destroyer OS is online now Destroyer OS  United States
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Quote:
pocomo 2
pistollero 2
jmc207 2
webber 2
wcwc 1
springnr 2
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Old 12th July 2017, 03:06 PM   #15
pocomo is offline pocomo
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I'd like to bump my order from 2 sets to 4; xmas is less than 6 months away
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Old 12th July 2017, 08:58 PM   #16
xrk971 is online now xrk971  United States
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Folsom DIY7297 Amp & Antipole PSU
When I built this amp, I did not have a huge stash of OSCONs on hand. I might try rebuilding it with the huge oscon array and see how it sounds. Although I really do like my discrete mosfet Class AB amps overall for maximum bass authority over any chip amp.

This thread needs some pics. Here is my implementation: I used a small GPU heatsink with fan and 7812 for powering the fan (drop speed with resistors to keep quiet), I have a mishmash of caps on the array, I added an LED - can't have an amp without a light. there is no case it's just mounted on a wooden board along with banana multiway output jacks.

Click the image to open in full size.
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Last edited by xrk971; 12th July 2017 at 09:03 PM.
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Old 12th July 2017, 09:14 PM   #17
Destroyer OS is online now Destroyer OS  United States
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The 7297 can be light in the bass if a speaker is ported/vented with too low of QES (too much physical dampening is bad too). The simple solution is to take the speaker impedance (4 , 6 , 8 ohm) and divide by 5.45 and get a resistor of that value to insert in series with the speaker. I've heard 500w amps sound wimpier. It's worth a try if you know your driver is in the .30's QES.

Quote:
pocomo 4
pistollero 2
jmc207 2
webber 2
wcwc 1
springnr 2

Last edited by Destroyer OS; 12th July 2017 at 09:17 PM.
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Old 12th July 2017, 09:47 PM   #18
BRN is offline BRN  United States
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I want to get another amp while I can. Thanks Brad
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Old 12th July 2017, 10:50 PM   #19
Destroyer OS is online now Destroyer OS  United States
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Quote:
pocomo 4
pistollero 2
jmc207 2
webber 2
wcwc 1
springnr 2
BRN 1
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Old 12th July 2017, 11:26 PM   #20
Destroyer OS is online now Destroyer OS  United States
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The new boards that fit the Jantzen red 1.5uf are nice. The sound of the Jantzen's while about 4x the price over the original spec'd units (unbeatable for the price) they are a nice little upgrade. Dave from PiAudio recommended them to me, actually.

XRK I hope those caps are 1.5uf or better, as anything less = less bass. I bet you'd really like the OSCON sound. The Pannies and Nichie's are pretty close despite price. The Nichie's are a little more open in a way but it's not "better" per se. Are you using the old or new TL431? The OnSemi makes the amp cleaner but not as warm. The TI works but the KMR section wasn't quiet up to par with some of the regulators seen around the DIYaudio, but with the OnSemi it's comparable with noise to things like some fancy SMD LDO's and such.

On, and twist your wires! Looks like a hooligan came in and wired the speakers outputs for you.
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