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Old 4th February 2013, 11:48 PM   #1
diyAudio Member
Join Date: Feb 2013
Default Sure TDA7492 board - adding a standby and volume pot (bass amp)

forgive me if this info is easily found else where , i honestly searched two times and came up empty handed .

so i have 2 cabinets , with 12 inch ev bass speakers . the first amp in it was purchased off ebay , it came with a chassis , i thimk it was 25x2 sure amp , run off a 7mah sla , i added a stereo one transistor boost . we use it as a bass guitar amp for remote jam sessions . the bass goes into a lil zoom b2 multi effects , then stereo out to the booster , then into the amp . we dont run the boost maxed out , just a bit to push .

the bass multi-effector has a lil drum machine in it , so thats our drummer as well . it wasnt quite loud enough to keep up with the other guitar amps ( similar designs) but with a lil boost it worked well . we ran all these amps for at least a dozen 4 hour sessions , and that bass amp ran on a power supply for an 8 hour session once , no problems yet .

i ordered a AA-AB32174 board and wired it in place of the old amp . its in a mini lunchbox enclosure . the teest i did last night , it was very loud , even on low gain dip switch . when i shut it down there was a loud pop .

i tried disconnecting the booster and the pop is minimal .

i may choose to loose the booster at this point , it may be unnecessary .

i see the rotary board kit , there isnt much room , if i do get this , can i run extention wires or will that be bad / noise . the etentions would be prolly 8 to 10 inches . run from the amp board to where the booster used to be .

or can i go with a pot ? if so a wiring diagram and pot value type would be awesome .

do i NEED a standby ? is it simple to add a mute switch for popping at shut down or is this silly .

should i mess with adding a capacitor to the power supply line , like in a car system ?

i grabbed a ps out of a printer , its 25 v 1.5 amp , would this harm the unit , or cripple it ? indoor use may be nice at some point but ...

any other recommendations on this project ?

i have a painful back injury so i try to keep my tinker time down by asking a lot of questions , i appreciate any info , thanks so much ...

the board page :

2 X 50Watt Class D Audio Amplifier Board - TDA7492_Class D Amplifier Board_Audio Amplifier and other Audio Boards_Audio_Sure Electronics' Webstore

the board manual ..... :


the board schematic :


sorry to ask so many questions , any point in the right direction would be great , i will be doing a video when finished ...

petey twofinger - YouTube
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Old 5th February 2013, 05:36 AM   #3
Astera is offline Astera  United States
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Join Date: Dec 2005
Location: CA
i see the rotary board kit , there isnt much room , if i do get this , can i run extention wires or will that be bad / noise . the etentions would be prolly 8 to 10 inches . run from the amp board to where the booster used to be . =
Does the rotary board work with this amp? I have the rotary board paired with one of their smaller amp boards (the model from Parts Express, BTW).

In any event the volume control was digital (a rotary encoder) and not a pot *so length of the wires (within reason) does not appear to be an issue.

The rotary board I see at sureelectronics has a different daughter board though so I may be talking about something else....
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Old 5th February 2013, 04:28 PM   #4
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Join Date: Feb 2013
yes , it gives a part number in the manual for the proper rotary board . this board is 10 dollars it has two additional part numbers listed for amp boards that it works with , and a daughter board .

thanks for the reply !
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Old 9th February 2013, 11:32 PM   #5
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Join Date: Feb 2013
i removed the booster , it was totally unecessary with this module . the last module the booster did help . i am going to try to see if we can get away twith not buying the volume control . the digital board that is ten from sure .

can anyone point me towards how to wire up a pot on this amp board ? i have parts here , stereo pots , res. caps , etc . i have the skills , just not sure and i honestly cant find the info ?

amy one ?

how to wire a volume pot on this amp board ...

please ?
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Old 10th February 2013, 07:59 PM   #6
Budgie is offline Budgie  United States
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Join Date: Jan 2003
Location: Not were I'm suppose to be......
Just use a stereo volume pot between the source and the amp input jacks.
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