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Post by PinkFloyd on Jan 5, 2011 20:11:53 GMT
Yes, but it states that the Panda kit is no longer available, hmmmmm!! Oh, I see! Sorry. I have 5 kits available... £50 per kit. |
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Post by Deleted on Jan 6, 2011 14:11:36 GMT
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Post by clausdk on Jan 6, 2011 23:05:07 GMT
I also have a few kits lying around if anybody is interested
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Post by Deleted on Jan 6, 2011 23:18:21 GMT
Yes, but it states that the Panda kit is no longer available, hmmmmm!! Oh, I see! Sorry. I have 5 kits available... £50 per kit.[/quote Hi Mike, Are these kits the sort of project that a soldering numptie like me could cope with? If so, what would I get for my £50, or, more usefully, what else would I need to buy? Cheers, Dave. |
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Post by PinkFloyd on Jan 6, 2011 23:40:59 GMT
Yes, but it states that the Panda kit is no longer available, hmmmmm!! Oh, I see! Sorry. I have 5 kits available... £50 per kit.[/quote Hi Mike, Are these kits the sort of project that a soldering numptie like me could cope with? If so, what would I get for my £50, or, more usefully, what else would I need to buy? Cheers, Dave. Hi Dave, NO...... they are not suited to a beginner. Mike. |
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Post by gumleguf on Jan 9, 2011 12:27:58 GMT
Hi all, Having spent hours now browsing through the various posts about the Panda DIY kit, I'm sitting with a feeling that vital information is scattered across the posts and as such is it very difficult for me to get an overview of the project. Am i overlooking something or is there a collection of information somewhere? I'm thinking everything from parts list, best practices when soldering the PCB, initial setup/test and various small improvements. I'm talking a dedicated section with detailed descriptions much like can be found for the CKKIII for instance: www.amb.org/audio/ck2/It will all come together for me eventually I'm sure, it would just be very convenient for us noob's to have it all in one place.  Cheers, Greg |
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Post by Deleted on Jan 9, 2011 12:35:48 GMT
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Post by gumleguf on Jan 9, 2011 20:33:42 GMT
Thanks for the hint. That wasn't clear to me. If you'd do that you'd help a lot of people. |
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Post by mingo on Jan 10, 2011 11:46:18 GMT
If you would make that pdf, Frans, it would be a great help to all of us not in the know.
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Post by Deleted on Jan 24, 2011 10:50:29 GMT
here is a funny question.
I see a lot of people worrying about low Ohmic power supplies and fast diodes and stuff and cleaning mains connectors and installing mains filters, yet nobody seems to have shorted the 2.2 Ohm resistors in the power supply path of the Panda (that will lower the impedance of the AC circuit considerably)
I already mentioned such in one of the first posts in this thread..
Mind you, they are there for a reason but funnily enough they are not found in most power supply schematics.
They 'filter' differential mode garbage in the AC power supply part.
curious to hear from people what effect it has (shorting them or even changing them for other values)
No time to make a pdf but cleaned up the build thread (took me 3 hrs)
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Post by mrslim on Jan 26, 2011 4:56:14 GMT
Those resistors(which are 3.1's in my kit) have been on my mind since I read your post, debating whether to remove or short them while building the amp. Then I figured I should try it first, to see what kind of difference in the sound shorting them makes.. Ive had the board built for over a week and have received my Par-Metal order, guess I should get off my a** and get at it.. Now that you've mentioned it again, I am definitely going to try it.... IRC, Lower power supply impedance should tighten up the bass, should it not?
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Post by Deleted on Jan 29, 2011 19:27:09 GMT
NOT gonna tell.  Here is another tip: I believe it was Leo that correctly mentioned the resistors in the 18V supply circuit that can be exchanged for CCS. That would be my other choice of tinkering with it. IF you have installed 0.4 to 0.5W 18V zeners the optimal current for the CCS will be between 5 and 7mA If the original 1.3W is installed 10-15mA will be about optimum. Installing a CCS will give lower 100Hz hum on the output and make it more stable. CCS can be made in various ways. IF you want to keep using resistors instead of modifying the circuit to CCS, you can calculate the optimal/proper value of the resistors and optimise the zener circuit this way. This is what you need to do: Measure the voltage over R7 (a 1.5k resistor) and R18 (they should be about the same voltage) If you have a 0.4W to 0.5W zener installed calculate R7/R18/R35/R51 as follows: 150 Ohm per Volt so if there is 8V over it.. 8*150 Ohm = 1200 Ohm (-> 1k2) IF you have the original 1.3W zener installed: 82 Ohm per Volt so if there is 8V over it.. 8*82 Ohm = 656 Ohm (-> 680 Ohm) Take any 'known' value nearest the calculated value, doesn't need to be exact. If your calculated value (which depends on the actual output voltage of the transformer) is very close to the original 1k5 leave it in. IF you calculated lower values you can either calculate a value that you can mount in parallel under the board instead of taking it out. Here is how to calculate the parallel value in case the calculated value is LOWER then the already placed 1500 Ohm resistor: 1/optimised calculated value (Ohms) - 1/1500 = 1/parallel resistor. use minimal 0.5W rated resistors. This is easy to do and lowers the remaining hum in the regulator circuit, stability and internal powersupplies's internal resistance.  What the 'sonical' advantages are/will/appear to be is for you to decide. another thing to tinker with is resistors R6/R17/R34R50 which can be deleted (shorted NOT removed) or made considerably smaller. Now they are 1k but can be anything between 0 Ohm and 100 Ohm for instance. NOTE: You should only mod this mod/experiment when you have properly adjusted the zener's bias current as explained above.  |
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Post by st on Oct 23, 2012 20:38:24 GMT
Hi pinkflloyd, any panda kits left?
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XTRProf
Fully Modded
Pssst ! Got any spare capacitors ?
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Post by XTRProf on Oct 23, 2012 23:30:59 GMT
The latest design is already out. But I'm not sure it's available as a Panda kit form.
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Post by PinkFloyd on Oct 24, 2012 9:24:42 GMT
Hi pinkflloyd, any panda kits left? Yes, I have three left PM me for details. Mike. |
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