New home for preamplifier
This was dropped off today. It took a little longer than promised but it was from a good friend and it was free!
A custom veneered cabinet for my Kook and the front Formica veneer is from the 60's and came from an old lumber store going out of business sale.
I gave my friend the metal enclosure and I told her I wanted it to look like old stereo gear used to look. So this is what she came up with.
This was dropped off today. It took a little longer than promised but it was from a good friend and it was free!
A custom veneered cabinet for my Kook and the front Formica veneer is from the 60's and came from an old lumber store going out of business sale. I gave my friend the metal enclosure and I told her I wanted it to look like old stereo gear used to look. So this is what she came up with.
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Lot of gain
Hey Man! This thing is loud but it sounds good! It's first song was New Rhumba remastered Miles Davis, I was trying to keep it down at 2:30AM...
Is there a way to adjust the overall gain to lower it or am I talking nonsense?
I'm ready to shoe this into the wood box if I can get the green light...
Cheers,
Shawn.
Hey Man! This thing is loud but it sounds good!
It's first song was New Rhumba remastered Miles Davis, I was trying to keep it down at 2:30AM... Is there a way to adjust the overall gain to lower it or am I talking nonsense?
I'm ready to shoe this into the wood box if I can get the green light...
Cheers,
Shawn.
Attachments
Re: Lot of gain
Hi, and thanks.
There are at least two ways you can lower the gain...
One, place a shunt resistor on the pot from the wiper to GND, this will lower the wiper voltage from the pot, and the amp will not go to full volume (because the ADC is referenced to +5V) so decide how much gain you actually want as a percentage, and then choose a resistor that will get you a voltage that is equal to that percentage of 5V.
Two, change the firmware(I have firmware that only goes up to 0db). If you have the ability to program the PIC I will post the HEX.
Cheers!
Russ
TomWaits said:
Hi, and thanks.
There are at least two ways you can lower the gain...
One, place a shunt resistor on the pot from the wiper to GND, this will lower the wiper voltage from the pot, and the amp will not go to full volume (because the ADC is referenced to +5V) so decide how much gain you actually want as a percentage, and then choose a resistor that will get you a voltage that is equal to that percentage of 5V.
Two, change the firmware(I have firmware that only goes up to 0db). If you have the ability to program the PIC I will post the HEX.
Cheers!
Russ
Re: Re: Lot of gain
The resistor thing worked pretty good but I think I'l get a small pic kit and do the tweak throught the firmware and I'll bug you later for it.
I'm just playing some Alarm Will Sound - Aphex Twin cover's through it and it sounds great. I thought it may sound a little clinical but it doesn't at all. It seems pretty neutral. Great little circuit man! I think I should add a remote? I may put a selector switch on it with two more inputs to chose from. Also, I will pop a gold knob(s) on it the next time I order from Parts Connexion.
Thanks again to Russ and the Pears Brothers!
Russ White said:
Hi, and thanks.
There are at least two ways you can lower the gain...
One, place a shunt resistor on the pot from the wiper to GND, this will lower the wiper voltage from the pot, and the amp will not go to full volume (because the ADC is referenced to +5V) so decide how much gain you actually want as a percentage, and then choose a resistor that will get you a voltage that is equal to that percentage of 5V.
Two, change the firmware(I have firmware that only goes up to 0db). If you have the ability to program the PIC I will post the HEX.
Cheers!
Russ
The resistor thing worked pretty good but I think I'l get a small pic kit and do the tweak throught the firmware and I'll bug you later for it.
I'm just playing some Alarm Will Sound - Aphex Twin cover's through it and it sounds great. I thought it may sound a little clinical but it doesn't at all. It seems pretty neutral. Great little circuit man! I think I should add a remote?
I may put a selector switch on it with two more inputs to chose from. Also, I will pop a gold knob(s) on it the next time I order from Parts Connexion.Thanks again to Russ and the Pears Brothers!
Attachments
Okay, here are three variations of the Kook hex.
First, the standard issue, from -95.5dB to +31.5dB range.
Second, the 0dB version, from -95.5dB to 0dB.
Third is one I came up with while tuning for a RevC I built for someone. It goes from -71dB to +24dB, and seemed to suit the amp well.
Enjoy!
First, the standard issue, from -95.5dB to +31.5dB range.
Second, the 0dB version, from -95.5dB to 0dB.
Third is one I came up with while tuning for a RevC I built for someone. It goes from -71dB to +24dB, and seemed to suit the amp well.
Enjoy!
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