Just as 2N5089 or 2N5088 but with lower noise (1.5dB)...sinner wrote:Transistors are MPSA18???
Pete Cornish - P-2 guts
simulation on TSC:
A little hump in the mid at 50%, and fully counter clockwise we can see a huge attenuation around 3Khz, as described one the cornish website:
A little hump in the mid at 50%, and fully counter clockwise we can see a huge attenuation around 3Khz, as described one the cornish website:
http://petecornish.co.uk/SAEP-2.htmlThe tone facility on the P-2™ has been designed to provide an attenuation of 14dB at 3KHz when set fully Counter Clockwise.
- frequencycentral
- Cap Cooler
Big orange button or babes and boobs.............and you hit the big orange button.Greg_G wrote:You have to click on the big orange button and then wait a while for the time to count down.frequencycentral wrote:I just see babes and boobs.
- lolbou
- Old Solderhand
And what about the generator Z and the load Z? I bet these values are default but they do not really match the real ones. It might affect the sound...dav9rock wrote:I'm sorry but the schematic says that the capacitor in tone section is 1nF instead of 10nF as you entered in the TSC
- Are you a mod or a rocker?
- Uh, no, I'm a mocker.
- Uh, no, I'm a mocker.
- analogguru
- Old Solderhand
Information
Oh, oh, oh..... I can see dark clouds coming up across the nimbus.
BTW, my Ibanez FZ5 has an additional input buffer too - the OD-850 already had it.
BTW, a varistor is not "RF-stuff" - it only protects against overvoltage. If there is any, a S07K12 or S14K12 should do it.
analogguru
BTW, my Ibanez FZ5 has an additional input buffer too - the OD-850 already had it.
Who cares about this ?lolbou wrote: Too bad, and there isn't anything about the varistor and two resistors used on the input jack (his RF stuff?)..
BTW, a varistor is not "RF-stuff" - it only protects against overvoltage. If there is any, a S07K12 or S14K12 should do it.
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- culturejam
- Old Solderhand
Information
I though the MPSA18 usually had higher current gain than the 5088/89?lolbou wrote:Just as 2N5089 or 2N5088 but with lower noise (1.5dB)...sinner wrote:Transistors are MPSA18???
Skreddy has gone on about how the hFE has an impact on the sound of a Muff. I've never tested this myself.
- lolbou
- Old Solderhand
Well, I do... Quite hard to know what is the blue disk on the blurry pic. I can see resistors. And I thought at first it was a varistor. Or is it a capacitor for RF rejection? This other choice was just a question that I wrote down in brackets...analogguru wrote: Who cares about this ?
BTW, a varistor is not "RF-stuff" - it only protects against overvoltage. If there is any, a S07K12 or S14K12 should do it.
analogguru
And I'm interested in the switching board too (many solders on it), looks like a 3PDT?
And the buffer too.
Indeed! But some more details of the whole unit may have brought thunder or sunshine, delete where inapplicable...analogguru wrote:Oh, oh, oh..... I can see dark clouds coming up across the nimbus.
- Are you a mod or a rocker?
- Uh, no, I'm a mocker.
- Uh, no, I'm a mocker.
Yes, it can affect the sound but the comparison is only for the tone stack... I don't think that a change in the generator Z can be a problem to understand how the P2 works... i mean that this graphic is not far from the truth but the cap. is wrong... it's must change it with 1nF to have the right graphlolbou wrote:And what about the generator Z and the load Z? I bet these values are default but they do not really match the real ones. It might affect the sound...dav9rock wrote:I'm sorry but the schematic says that the capacitor in tone section is 1nF instead of 10nF as you entered in the TSC
In fact, EchO is right with his simulation, i did a mistake in copying what i have, it's 10nF. (I did it from a handwritten schemo, I can scan it if you want)
Sorry for the inconvenience, let me know if you have others questions.
Sorry for the inconvenience, let me know if you have others questions.
Last edited by Ulysse.Gaunarol on 22 Aug 2009, 21:52, edited 1 time in total.
- lolbou
- Old Solderhand
Yes, slightly higher, or at least the minimal values on the datasheet are lower. I bet you can select equivalent one out a bunch?culturejam wrote:I though the MPSA18 usually had higher current gain than the 5088/89?
Skreddy has gone on about how the hFE has an impact on the sound of a Muff. I've never tested this myself.
- Are you a mod or a rocker?
- Uh, no, I'm a mocker.
- Uh, no, I'm a mocker.
- Dirk_Hendrik
- Old Solderhand
Information
Glad to see we learned from te mistery Klon schematic!
- Dirk_Hendrik
- Old Solderhand
Information
so?frequencycentral wrote:I just see babes and boobs.
What exactly is the problem!?
Information
I needed something fun to do afternoon, so I adapted this from another muff project I have. Maybe I will have time to actually build it
I added some power filtering, LED stuff.
I added some power filtering, LED stuff.
- culturejam
- Old Solderhand
Information
Dirk, are you suggesting that the above posted schematic might be a fake?Dirk_Hendrik wrote:Glad to see we learned from te mistery Klon schematic!
- modman
- a d m i n
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Well have you ever....
Thanks Ulysse, for sharing, don't take this personal, but here's the devil's advocate...
If you didn't draw it yourself last night, it's still an important document. Then it's circulating (already sometime) as if this is the P2. That's why gutshots and degooping is still important, although JiM's remarks are the way to go, for now. Counting components. On the other hand, if it's already circulating since 2006, this might explain the source of all rumours.
The only thing that's very suspicious is the use of the Cornish logo - this makes this document a trademark infringement. Why, is this necessary? It really might be some zealous guy's copy past work... but why devote so much time to the logo and none on tracing the mysterious Cornish buffer
Even pictures of gooped Cornish boards are important - sad Ech0es didn't take any. But we'll get by, n'est ce pas, mon ami?
Thanks Ulysse, for sharing, don't take this personal, but here's the devil's advocate...
If you didn't draw it yourself last night, it's still an important document. Then it's circulating (already sometime) as if this is the P2. That's why gutshots and degooping is still important, although JiM's remarks are the way to go, for now. Counting components. On the other hand, if it's already circulating since 2006, this might explain the source of all rumours.
The only thing that's very suspicious is the use of the Cornish logo - this makes this document a trademark infringement. Why, is this necessary? It really might be some zealous guy's copy past work... but why devote so much time to the logo and none on tracing the mysterious Cornish buffer
Even pictures of gooped Cornish boards are important - sad Ech0es didn't take any. But we'll get by, n'est ce pas, mon ami?
Yeah you cannot jump a bandwagon you're pulling yourself...briggs wrote:I wouldn't be surprised. It's been thought for a long time that the P-2 was a big muff...JOHNO wrote:I dont think this is right. Surely pete cornish would not jump on the bootweek big muff band wagon.
Please, support freestompboxes.org on Patreon for just 1 pcb per year! Or donate directly through PayPal
Don't forget about pics uploaded by hoppekee here:modman wrote:Even pictures of gooped Cornish boards are important - sad Ech0es didn't take any. But we'll get by, n'est ce pas, mon ami?
https://www.freestompboxes.org/viewtopic.php?f=7&t=4721&
Tone pot is Alpha, B25k...
If we look at thegearpage thread about the rehoused P2On the other hand, if it's already circulating since 2006, this might explain the source of all rumours.
The ted witcher message is dated of the 28 december 2006, and the schematic is dated 5 december 2006.He did the rehousing of the Ted Witcher's P-2:
http://www.thegearpage.net/board/showth ... 9&page=257
The cornish logo can be reproduced with the font "army", the logo on his website and paint, nothing difficult. But yeah, why one circuit and not the other ?The only thing that's very suspicious is the use of the Cornish logo - this makes this document a trademark infringement. Why, is this necessary? It really might be some zealous guy's copy past work... but why devote so much time to the logo and none on tracing the mysterious Cornish buffer
Maybe Paul garisson didn't degooped it because he doesn't have enough space in the new box for the buffer.
Maybe the are several version of P2, all builder change their circuits, boss,ibanez, ehx etc...pf_fan wrote: Don't forget about pics uploaded by hoppekee here:
https://www.freestompboxes.org/viewtopic.php?f=7&t=4721&
Tone pot is Alpha, B25k...
Moreover, pete cornish do some several adjustment if you order directly from his website, you can ask him to have your own sound. (more bass, less gain etc...)
Last edited by ech0es on 22 Aug 2009, 23:16, edited 1 time in total.