I meant the schematic, but then i went back and found it a couple pages back.
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| The workbench thread http://maplifiers.net/forum/viewtopic.php?f=7&t=122 |
Page 12 of 18 |
| Author: | chris_d [ Mon Apr 18, 2011 7:17 pm ] |
| Post subject: | Re: The workbench thread |
I meant the schematic, but then i went back and found it a couple pages back.
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| Author: | Zozobra [ Thu Apr 21, 2011 6:36 am ] |
| Post subject: | Re: The workbench thread |
Its a bank holiday tomorrow so I'm gonna give this a good looking over before I go to be a noisy bastard with my band. |
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| Author: | Zozobra [ Mon Apr 25, 2011 10:16 am ] |
| Post subject: | Re: The workbench thread |
So the PI doesnt work properly because the useless twat I bought me components on has given my 820R resistors rather than 82K resistors. This probably explains why one side of the PI can produce 35Vpp and the other side only 0.7Vpp. Fucks sake. Yeah I know I should check the component values first but you'd expect them to be right... |
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| Author: | chris_d [ Mon Apr 25, 2011 10:52 am ] |
| Post subject: | Re: The workbench thread |
Ah! Yes, that would be a problem. Well, it is good that you figured it out. I haven't had any sort of issue like that so i didn't have much to suggest. I am pretty compulsive about quadruple checking values throughout the building process though. Though it is not really a big deal, i haaaaate unsoldering things once they are in. 
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| Author: | Zozobra [ Mon Apr 25, 2011 6:00 pm ] |
| Post subject: | Re: The workbench thread |
There are other things wrong too but at least when I put a sine wave into the PI I get a sine wave out of the speakers rather than half a sine wave  I should probably build a dummy load box so I can look at the output waveform. |
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| Author: | knope [ Mon Apr 25, 2011 6:17 pm ] | |||||||||
| Post subject: | Re: The workbench thread | |||||||||
THIS!!!!
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| Author: | eddiemunster666 [ Mon May 23, 2011 7:23 pm ] | |||||||||||||||||||||||||||
| Post subject: | Re: The workbench thread | |||||||||||||||||||||||||||
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| Author: | eddiemunster666 [ Mon May 23, 2011 7:25 pm ] | ||||||||||||||||||
| Post subject: | Re: The workbench thread | ||||||||||||||||||
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| Author: | torgeot [ Tue May 24, 2011 9:49 am ] |
| Post subject: | Re: The workbench thread |
what the... holy crap 
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| Author: | Devtron [ Tue May 24, 2011 1:13 pm ] |
| Post subject: | Re: The workbench thread |
Rackmount Compressor? That thing is sexy looking though. |
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| Author: | Snaxocaster [ Tue May 24, 2011 1:19 pm ] |
| Post subject: | Re: The workbench thread |
Homebrew LA-2A? |
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| Author: | Zozobra [ Tue May 24, 2011 1:20 pm ] |
| Post subject: | Re: The workbench thread |
Looks cheeky whatever it is. I have the bits on order to build the aforementioned dummy load so I can work out what I fucked up 
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| Author: | eddiemunster666 [ Tue May 24, 2011 4:06 pm ] |
| Post subject: | Re: The workbench thread |
Yes LA2a clone. |
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| Author: | Zozobra [ Fri May 27, 2011 6:30 am ] |
| Post subject: | Re: The workbench thread |
Bits for the dummy load are here. Gonna get that mother strapped together tomorrow. Nothing too fancy - just a 50W 15R aluminium clad resistor in a box with a BNC connector. |
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| Author: | Zozobra [ Sun Jul 17, 2011 8:00 am ] |
| Post subject: | Re: The workbench thread |
A mere 2 months later here it is   
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| Author: | eddiemunster666 [ Sun Jul 17, 2011 8:36 pm ] |
| Post subject: | Re: The workbench thread |
Is the "Dummy Load" some kind of stencil or sticker? Did the box come that way or did you do that some how? |
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| Author: | Zozobra [ Mon Jul 18, 2011 6:38 am ] |
| Post subject: | Re: The workbench thread |
I used a thermal label printer. If you put enough clearcoat on top you cant see the edges of the label. I didnt bother here though. |
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| Author: | eddiemunster666 [ Mon Jul 18, 2011 8:01 am ] |
| Post subject: | Re: The workbench thread |
ahhhh now we know your tricks! 
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| Author: | Zozobra [ Mon Jul 18, 2011 10:25 am ] |
| Post subject: | Re: The workbench thread |
Its not the best way ever but it works. If you want it to look nice I'd look into something else
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| Author: | Zozobra [ Wed Jul 20, 2011 6:48 am ] |
| Post subject: | Re: The workbench thread |
Ha! I'm getting one half of the waveform on the output. Time to look into the power amp to see what I've fucked up
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