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Topic: Need 18 Volt PS For Match-Bro |
Bob Snelgrove
From:
san jose, ca
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Bill Burch
From:
California, USA
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Posted 25 Jun 2018 6:08 pm |
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Bob,
Have you verified that the two 9v batteries in the Match Bro are connected in series, netting 18 volts? If so, the wall warts should probably work, since the circuit draws so little current (batteries last along time). However, if the design was one where the two batteries provided 9 volts to two different parts of the circuit, the the 18v wall wart won't work.
Another issue is now you'd also be introducing a potentially poorly regulated AC device into your signal chain which could also cause hum issues.
I'll be curious to see what others think.
Bill |
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Bob Snelgrove
From:
san jose, ca
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Posted 25 Jun 2018 7:20 pm
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| Bill Burch wrote: |
Bob,
Have you verified that the two 9v batteries in the Match Bro are connected in series, netting 18 volts? If so, the wall warts should probably work, since the circuit draws so little current (batteries last along time). However, if the design was one where the two batteries provided 9 volts to two different parts of the circuit, the the 18v wall wart won't work.
Another issue is now you'd also be introducing a potentially poorly regulated AC device into your signal chain which could also cause hum issues.
I'll be curious to see what others think.
Bill |
Good points. I guess I could try with one 9V at a time and see and yes, no hum please?
bob |
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Donny Hinson
From:
Glen Burnie, Md. U.S.A.
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Posted 26 Jun 2018 6:59 pm
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| Right, you must determine if the two 9v batteries are wired in series. If they are, then an 18v power supply would work. But, like Bill said, there's a chance that the circuit in the unit requires bipolar power +9v, 0v, -9v. In that case, a regular 18v power supply would not suffice. |
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Bob Snelgrove
From:
san jose, ca
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Posted 26 Jun 2018 9:18 pm
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| Donny Hinson wrote: |
| Right, you must determine if the two 9v batteries are wired in series. If they are, then an 18v power supply would work. But, like Bill said, there's a chance that the circuit in the unit requires bipolar power +9v, 0v, -9v. In that case, a regular 18v power supply would not suffice. |
What's the best way to tell? Try just one battery at a time and see if it works? |
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Bill Burch
From:
California, USA
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Posted 26 Jun 2018 9:49 pm
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You have to do a bit of detective work. Look at the black and red wires coming off the two 9v batteries. If you see the black wire from Battery A connected to the red wire of Battery B, the you're pretty much assured the batteries are wired in series providing 18 volts to the circuit. If the black and red wires connect directly to the circuit board and don't seem to be immediately tied together by a trace, then it's more likely that the two batteries power 2 different parts of the circuit,
You could always get a 9v wall wart and some alligator clips and see what happens if you clip from the + side if the wall wart power connector to BOTH red connections on the 9v battery connect. Test with a continuity tester to make sure you've correctly identified the right snap on battery connector as the red + wire. Do the same for the negative contact on the power plug to the two minus - battery connectors.
Then again..batteries in these last forever. Do you really need to go the plug in route? You can always install an on-off switch to avoid unplugging the 1/4" cables every time.
Bill |
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b0b
From:
Cloverdale, CA, USA
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Jack Stoner
From:
Kansas City, MO
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Posted 27 Jun 2018 2:09 am
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I only use batteries in my MatchBro and never had a problem. The batteries, at least in my case, will last close to a years use. I added a Power on/off switch to mine so I don't have to keep unplugging the input guitar cord.
Years ago there were discussions on the power supply needed and it was supposed to be a "special" power supply. What kind? I don't remember. |
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Jon Light (deceased)
From:
Saugerties, NY
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Posted 27 Jun 2018 4:42 am
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FWIW, I powered my MatchBro on a very large pedalboard from my VooDooLabs Pedal Power 2, using a commercial Y cable from two 9V outputs. I presume that you can only do this with truly isolated outputs such as what are found on the PP2.
Maybe this info helps in trying to identify the type of power scheme that is used on the unit. |
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Bob Snelgrove
From:
san jose, ca
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Posted 27 Jun 2018 5:22 am
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That needs an 18v power supply to power it?? (18V in)
bob |
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b0b
From:
Cloverdale, CA, USA
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John Groover McDuffie
From:
LA California, USA
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Posted 27 Jun 2018 5:19 pm
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Both wall warts linked above have the barrel connectors and my MatchBro, and I think most of them, have a 1/8" phone jack for the DC in, so you will probably need an adapter.
And take note - the standard DC barrel connector in effects pedals, and the Jim Dunlop wall wart referenced above, are wired center negative, while 1/8" DC inputs are almost always wired center positive. and fyi the barrel connector should have a socket for a 2.1mm center pin. Some are made for a 2.5mm pin.
The Triad, I notice, can be used either center + or center -, but you would still need an adapter to 1/8"
From Truetone you could use, on this page:
http://truetone.com/1-spot-accessories/
a CYR (polarity reverser) and a C35 (barrel to 1/8")
Or you could use a normal 9v supply which you probably already have with one of these:
http://truetone.com/voltage-doubler/
this is a great solution if you are already using some kind of pedalboard with a 9v supply as I do.
Of course you'll still need the adapters to connect to the 1/8" phone jack.
If you search you can probably find an 18 volt wall wart with a 1/8" connector, and I've seen universal ones with interchangeable plugs or you could get one of the wall warts, cut off the connector, and wire on a 1/8" plug wired center positive. |
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Bob Snelgrove
From:
san jose, ca
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Posted 28 Jun 2018 2:33 pm
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| John Groover McDuffie wrote: |
Both wall warts linked above have the barrel connectors and my MatchBro, and I think most of them, have a 1/8" phone jack for the DC in, so you will probably need an adapter.
And take note - the standard DC barrel connector in effects pedals, and the Jim Dunlop wall wart referenced above, are wired center negative, while 1/8" DC inputs are almost always wired center positive. and fyi the barrel connector should have a socket for a 2.1mm center pin. Some are made for a 2.5mm pin.
The Triad, I notice, can be used either center + or center -, but you would still need an adapter to 1/8"
From Truetone you could use, on this page:
http://truetone.com/1-spot-accessories/
a CYR (polarity reverser) and a C35 (barrel to 1/8")
Or you could use a normal 9v supply which you probably already have with one of these:
http://truetone.com/voltage-doubler/
this is a great solution if you are already using some kind of pedalboard with a 9v supply as I do.
Of course you'll still need the adapters to connect to the 1/8" phone jack.
If you search you can probably find an 18 volt wall wart with a 1/8" connector, and I've seen universal ones with interchangeable plugs or you could get one of the wall warts, cut off the connector, and wire on a 1/8" plug wired center positive. |
Thanks, John
How the heck do you get 18v from 9V? I can see going down from 18 to 9 but how do they increase it?
bob |
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John Groover McDuffie
From:
LA California, USA
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b0b
From:
Cloverdale, CA, USA
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Godfrey Arthur
From:
3rd Rock
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