variable volume for the BBC

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avtovaz
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variable volume for the BBC

Postby avtovaz » Wed Mar 08, 2017 9:45 pm

Has anyone done this? Is it as simple as putting a potentiometer inline and a wire to the earth? Reason i ask is my brother moans its loud sometimes, and fair enough it is. I wanted to ask before i tried out anything and damaged it!

thanks!

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bakoulis
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Re: variable volume for the BBC

Postby bakoulis » Wed Mar 08, 2017 9:59 pm

Yes is possible, I have one at the back of my BBC B and one at the back of my A3200 because I am playing after midnight!
I can't help you how is done, because I didn't made the modification my alone and the man who had done has died before 2 years.
:(
2xElectron, 3xBBC B, BBC Master.
2xAcorn A310, A420/1, 2xA3000, 2xA3010, A3020, A4000, A5000.
2xRISC PC, Acorn Pocket Book, Acorn Pocket Book II.

tom_seddon
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Re: variable volume for the BBC

Postby tom_seddon » Thu Mar 09, 2017 1:48 am

I've done this with my Master 128 with a few bits of dupont cable, some jumper wires, and a bit of breadboard. I didn't really know what I was doing, so I plugged things in in various combinations, with seemingly no ill effects, so it seems like it's hard to do any damage :)

The max volume is now quite a bit lower than with the original direct connection, but that's probably a good thing.

--Tom

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tricky
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Re: variable volume for the BBC

Postby tricky » Thu Mar 09, 2017 1:17 pm

When I used to work for a company installing jukeboxes, we would often put a variable 50 ohm resister in line with the speaker if we didn't have access to do anything better.
The 50 shouldn't be that important, but most of the control is at the 0 end of the range.
For my own beebs, I add a headphone socket to the back in the vent slot that diverts the signal when something is plugged in and then add an audio in jack to the scart cables I make for rgb to TV.
You might just get away with turning the volume down a bit on the pot under the keyboard and then putting something over the speaker grill for a removable further attenuator, or slide a business card under the grill for gone control.

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CMcDougall
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Re: variable volume for the BBC

Postby CMcDougall » Thu Mar 09, 2017 7:02 pm

do people use the search on forums nowadays??... :roll:
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Beebvolpot.jpg
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avtovaz
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Re: variable volume for the BBC

Postby avtovaz » Thu Mar 09, 2017 10:03 pm

I had googled for the pot to be fair and could not find which it was !


Thanks, id like to be able to vary the level with out taking the casing off. But ill find that one tomorrow and turn it down and go from there!! thanks!

rusto
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Re: variable volume for the BBC

Postby rusto » Fri Mar 10, 2017 7:40 am

It's maybe not quite as simple as it sounds but there's a good explanation here...

https://www.youtube.com/watch?v=lb05bcu ... CCAD68FC25

avtovaz
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Re: variable volume for the BBC

Postby avtovaz » Fri Mar 10, 2017 7:20 pm

right was made up then and opened my machine, then reolised, i forgot to say, ive a master!!!


BTW, how do you tell what computer you have? I noticed it has a seperate board on plastic stilts with 512 written on some of the chips, so how can i tell what i have>?

thanks!

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1024MAK
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Re: variable volume for the BBC

Postby 1024MAK » Sat Mar 11, 2017 7:37 am

Post a photo of the insides... :wink:

But it sounds like you have a BBC Master 512 which has a second processor.
IMG_4083.JPG
Master 512 PCB

See here and here for more details.

Mark
For a "Complete BBC Games Archive" visit www.bbcmicro.co.uk NOW!
BeebWiki‬ - for answers to many questions...

avtovaz
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Re: variable volume for the BBC

Postby avtovaz » Sat Mar 11, 2017 10:29 pm

right thanks

can you see this link

CLICK HERE

thanks!!!!

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1024MAK
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Re: variable volume for the BBC

Postby 1024MAK » Sun Mar 12, 2017 6:43 am

avtovaz wrote:right thanks

can you see this link

CLICK HERE

thanks!!!!

Yep, link okay :D
And yes, you do have a Master 512 :D

Mark
For a "Complete BBC Games Archive" visit www.bbcmicro.co.uk NOW!
BeebWiki‬ - for answers to many questions...

avtovaz
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Re: variable volume for the BBC

Postby avtovaz » Sun Mar 12, 2017 2:26 pm

oh right, didnt know that, maybe the guy who gave it to me didnt know either!

i best research what i can do with it then!

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PitfallJones
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Re: variable volume for the BBC

Postby PitfallJones » Sun Mar 12, 2017 3:03 pm

I've actually disconnected my internal speaker all togther and take the audio out of the phono port at the back of the BBC straight into some powered pc speakers - that sound alot better and have their own volume control!
PJ

avtovaz
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Re: variable volume for the BBC

Postby avtovaz » Wed Mar 22, 2017 9:43 pm

worked it out for my case!

my beeb has the RGB to scart lead, that goes into a 4 way adapter to the tv, so i plugged in a phone cable to the audio out and used a RBG adapter in one of the other 4 ports for the sound, and it worked!!!

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YuT666
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Re: variable volume for the BBC

Postby YuT666 » Sat May 06, 2017 2:48 pm

Did something similar with my BBC Model B.

I think, that the volume knob suits to the BBCs (only my opinion).

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