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Chat Area => General Discussion Area => Topic started by: Migv6 le Frog Fan on 30 January 2019, 13:51:31

Title: Would the smoke leak out of the wires ? Electrickery question.
Post by: Migv6 le Frog Fan on 30 January 2019, 13:51:31: I have a little guitar practice amp here which can run off a 9v pp3 battery or a mains adapter.
Info on the back of the amp say 9v dc----200ma. I have an adapter which says 9v dc----300ma.
Will the extra 100ma make it go pop, or is it insignificant ?
Tia. :)
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: LC0112G on 30 January 2019, 14:05:04: Quote from: Migv6 on 30 January 2019, 13:51:31
I have a little guitar practice amp here which can run off a 9v pp3 battery or a mains adapter.
Info on the back of the amp say 9v dc----200ma. I have an adapter which says 9v dc----300ma.
Will the extra 100ma make it go pop, or is it insignificant ?
Tia. :)

It means the amp requires 200mA, but the adapter can supply up to 300mA. As long as the adapter can supply more current than the amplifier requires (which it can in this case) it'll be fine. The adapter won't attempt to "force" 300mA into the amp, and the amp probably won't be taking 200mA either unless you turn the volume up to 11.
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: STEMO on 30 January 2019, 14:16:03: God help the neighbours.
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: Kevin Wood on 30 January 2019, 14:19:28: Quote from: STEMO on 30 January 2019, 14:16:03
God help the neighbours.
9V at 200mA is 1.8 watts DC input. I'd be surprised to see 50% of that make it to the speaker, so we aren't going to be talking spinal tap here. ;D
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: zirk on 30 January 2019, 14:27:52: As said will be fine, the Amp will only Draw what it requires to feed its Load, ie, Speaker(s).

Now if the question was an increase in the 12V supply Voltage, then thats a different scenario.
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: STEMO on 30 January 2019, 14:29:50: Quote from: Kevin Wood on 30 January 2019, 14:19:28
Quote from: STEMO on 30 January 2019, 14:16:03
God help the neighbours.
9V at 200mA is 1.8 watts DC input. I'd be surprised to see 50% of that make it to the speaker, so we aren't going to be talking spinal tap here. ;D
No, you misunderstand. I meant living adjacent to Albs. :)
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: Kevin Wood on 30 January 2019, 16:18:10: Quote from: STEMO on 30 January 2019, 14:29:50
Quote from: Kevin Wood on 30 January 2019, 14:19:28
Quote from: STEMO on 30 January 2019, 14:16:03
God help the neighbours.
9V at 200mA is 1.8 watts DC input. I'd be surprised to see 50% of that make it to the speaker, so we aren't going to be talking spinal tap here. ;D
No, you misunderstand. I meant living adjacent to Albs. :)

Oh, just in general?

Point taken. ;D
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: STEMO on 30 January 2019, 16:42:42: Quote from: Kevin Wood on 30 January 2019, 16:18:10
Quote from: STEMO on 30 January 2019, 14:29:50
Quote from: Kevin Wood on 30 January 2019, 14:19:28
Quote from: STEMO on 30 January 2019, 14:16:03
God help the neighbours.
9V at 200mA is 1.8 watts DC input. I'd be surprised to see 50% of that make it to the speaker, so we aren't going to be talking spinal tap here. ;D
No, you misunderstand. I meant living adjacent to Albs. :)

Oh, just in general?

Point taken. ;D
I'll bet the local chippy does well. Every time Albs starts his 190 up, people start fancying fish and chips. ;D
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: aaronjb on 30 January 2019, 17:21:43: Assuming power comes in via a barrel jack, just make sure the polarity is the same (centre positive or centre negative) or you will let the smoke out ;D

There's usually a diagram on both device and adapter, just make sure it matches :)
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: Migv6 le Frog Fan on 30 January 2019, 17:59:59: Adapter says polarity - then a kind of circle thing then + amp says the same, so can blast the neighbours with 1 (yes one) watt of noise. :)
Thanks for the help everyone, apart from STEMO obviously who can far cough. :y :)
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: Migv6 le Frog Fan on 30 January 2019, 18:07:48: Bollix. After all that, the adapter doesnt work. ::) :(
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: STEMO on 30 January 2019, 18:29:29: Quote from: Migv6 on 30 January 2019, 18:07:48
Bollix. After all that, the adapter doesnt work. ::) :(
Your missus will be heartbroken ;D
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: scimmy_man on 30 January 2019, 18:40:35: I can hear the neighbours cheering from here.
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: Migv6 le Frog Fan on 30 January 2019, 18:48:38: Quote from: STEMO on 30 January 2019, 18:29:29
Quote from: Migv6 on 30 January 2019, 18:07:48
Bollix. After all that, the adapter doesnt work. ::) :(
Your missus will be heartbroken ;D

Its actually her amp for the guitar I bought her. I very rarelt play these days. Lost interest a long time ago. ;)
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: Bigron on 30 January 2019, 19:21:35: Albs, I should have a spare 6V adaptor here; if/when I find it, it's yours.

Ron.
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: STEMO on 30 January 2019, 19:38:57: Quote from: Migv6 on 30 January 2019, 18:48:38
Quote from: STEMO on 30 January 2019, 18:29:29
Quote from: Migv6 on 30 January 2019, 18:07:48
Bollix. After all that, the adapter doesnt work. ::) :(
Your missus will be heartbroken ;D

Its actually her amp for the guitar I bought her. I very rarelt play these days. Lost interest a long time ago. ;)
Alright, Albs, calm down, calm down. I'm only pullin yer leg, mate. ;D
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: Alnico Blue on 30 January 2019, 19:58:54: Quote from: Bigron on 30 January 2019, 19:21:35
Albs, I should have a spare 6V adaptor here; if/when I find it, it's yours.

Ron.

is it not a 9 volt one required Ron ?

ifyou don't get sorted Albs . . .I have several knocking about . . .

Problem is getting one to you at the north Essex outpost :-\
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: STEMO on 30 January 2019, 20:06:02: Quote from: Alnico Blue on 30 January 2019, 19:58:54
Quote from: Bigron on 30 January 2019, 19:21:35
Albs, I should have a spare 6V adaptor here; if/when I find it, it's yours.

Ron.

is it not a 9 volt one required Ron ?

ifyou don't get sorted Albs . . .I have several knocking about . . .

Problem is getting one to you at the north Essex outpost :-\
Post?
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: aaronjb on 30 January 2019, 20:06:12: Quote from: Migv6 on 30 January 2019, 17:59:59
Adapter says polarity - then a kind of circle thing then + amp says the same, so can blast the neighbours with 1 (yes one) watt of noise. :)
Thanks for the help everyone, apart from STEMO obviously who can far cough. :y :)

9V centre-positive AC-DC adapter, then.. Amazon, eBay etc.
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: Migv6 le Frog Fan on 30 January 2019, 20:44:19: Quote from: Alnico Blue on 30 January 2019, 19:58:54
Quote from: Bigron on 30 January 2019, 19:21:35
Albs, I should have a spare 6V adaptor here; if/when I find it, it's yours.

Ron.

is it not a 9 volt one required Ron ?

ifyou don't get sorted Albs . . .I have several knocking about . . .

Problem is getting one to you at the north Essex outpost :-\

Cheers both of you. Very kind. Yes Al its 9v. :y
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: Bigron on 30 January 2019, 20:49:18: My mistake, I mis-remembered without going back to read the original post! :-[ I could well have a 9 V adaptor, too: I will go looking tomorrow.

Ron.
Title: Re: Would the smoke leak out of the wires ? Electrickery question.
Post by: Andy H on 30 January 2019, 22:43:59: Does it need to be a regulated power supply? or does the amplifier have it's own smoothing / regulating circuitry?