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Permalink Reply by David McQueen on March 8, 2017 at 4:18am

Here is an interesting karioki preamp and reverb board in one.
http://www.ebay.com/itm/PT2399-Kara-OK-Reverberation-Board-Low-Nois...

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Permalink Reply by Timothy Hunter on March 9, 2017 at 2:25am

interesting find there David. certainly has potential. if i can decipher the chinglish i think this can run from 9 v or 12 v. seems to have a volume out and reverb controls and 2 x 1/4"inputs. if you can afford it it is worth a try at $10...closer to $15 AUD for me.

a little research on the PT2399 delay/echo chip gives good reviews ...

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Permalink Reply by David McQueen on March 9, 2017 at 4:11am

Actually, we are probably close to the same currencywise. I am in $CD which has kind of turned into a black hole compared to $US with the price of oil tanking. I will be putting together an order soon. Question: If I go this route, I should probably build a balance control. I understand that is just a pot wired differently. Any idea what size pot I would need?

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Permalink Reply by Timothy Hunter on March 9, 2017 at 11:05pm

are you talking about combining the 2 outputs of the preamp board to feed into a mono power amp section? 100k pot with channel 1 on one outside leg and the other channel going to the other outside leg and take the output to the amp from the centre wiper leg through a 47K resistor.

 

if you use the karaok reverb board from ebay you listed i dont think you need to. from what i can figure out from googling it and reading the amazon listing, the first two pots are mic1 and mic2 volume pots and the third is the delay/reverb control. so you get mixing of two signals at the preamp.

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Permalink Reply by David McQueen on March 10, 2017 at 2:26pm

Thanks for this.

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Permalink Reply by Anthony Tucker on March 9, 2017 at 2:58pm

OK this is what I have decided to go with. I will build it into my amp enclosure. It is 12V DC so I can use the the same power supply. I should have it this weekend and I will post pics when I start the build
https://www.amazon.com/gp/aw/d/B0152UED8W/ref=mp_s_a_1_1?ie=UTF8&am...

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Permalink Reply by Kigar on March 13, 2017 at 3:29pm

Thanks for the nudge, I had one of these for a while and finally finished it.  Two small Dell computer speakers with guitar jack and aux port.  Sounds good, and (sadly) the speakers stay clean all the way to full volume - which is a fairly modest bedroom level - unless an effects pedal is used.

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Permalink Reply by Timothy Hunter on March 13, 2017 at 10:51pm

very nice! i cant seem to get wooden boxes in Brisbane, well not at a reasonable price.

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Permalink Reply by David McQueen on March 14, 2017 at 3:05am

Can't get them here in Canada reliably either. I am just using pine boards glued and screwed with black drywall screws. Looks rustic yet finished at the same time.

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Permalink Reply by Anthony Tucker on March 15, 2017 at 6:37am

Very nice,  what type of amplifier did you use?

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Permalink Reply by Kigar on March 15, 2017 at 11:52am

Thanks, the amp was just like the one at the top of this discussion.

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Permalink Reply by Anthony Tucker on March 16, 2017 at 1:35pm

Did you use a preamp?

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