tag:blogger.com,1999:blog-5481402030233340127.post1483253088133486173..comments2024-03-28T17:24:07.520-04:00Comments on Perf and PCB Effects Layouts: EQD Bowsdtgehringhttp://www.blogger.com/profile/09555201436004501222noreply@blogger.comBlogger39125tag:blogger.com,1999:blog-5481402030233340127.post-89357466028129681022021-07-02T07:13:54.956-04:002021-07-02T07:13:54.956-04:00Hi,
I build a Beauregard pcb, with an AC176, and ...Hi,<br />I build a Beauregard pcb, with an AC176, and a 5k trimmer for R5, easier to bias it.<br />The treble position sounds great, but the"full" one is really really loud.Unkle Philhttps://www.blogger.com/profile/02483463543817522536noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-25611598214844844602021-04-28T02:52:24.006-04:002021-04-28T02:52:24.006-04:00Thanks a lot !
... and by the way: thanks for you...Thanks a lot !<br /><br />... and by the way: thanks for your PCBs, they are great!Unkle Philhttps://www.blogger.com/profile/02483463543817522536noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-68883175593411539882021-04-28T02:51:25.959-04:002021-04-28T02:51:25.959-04:00This comment has been removed by the author.Unkle Philhttps://www.blogger.com/profile/02483463543817522536noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-80515645808193415202021-04-27T16:35:15.097-04:002021-04-27T16:35:15.097-04:00It would need to be very low hFE. A 2N2369 might w...It would need to be very low hFE. A 2N2369 might work, but might still not bias correctly.Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-19018937856064721512021-04-27T10:35:36.673-04:002021-04-27T10:35:36.673-04:00Maybe my question is stupid , but... could I use ...Maybe my question is stupid , but... could I use a NPN silicon transistor?Unkle Philhttps://www.blogger.com/profile/02483463543817522536noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-11895281908004277972021-04-27T10:33:42.795-04:002021-04-27T10:33:42.795-04:00Great !
How do you wire the pot?Great !<br />How do you wire the pot?Unkle Philhttps://www.blogger.com/profile/02483463543817522536noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-23551432236903697262021-03-25T10:57:31.938-04:002021-03-25T10:57:31.938-04:00Hi!How did you wire the pot in place of the toggle...Hi!How did you wire the pot in place of the toggle?Thanks!Boukmanhttps://www.blogger.com/profile/15699313941924133575noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-1899121883108521052021-01-23T16:46:18.312-05:002021-01-23T16:46:18.312-05:00Thanks, I'll read up on how to calculate and m...Thanks, I'll read up on how to calculate and measure the adjusted hfe.<br />Timothy Shieldshttps://www.blogger.com/profile/07390497645578046268noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-61235520538499209882021-01-22T15:21:34.665-05:002021-01-22T15:21:34.665-05:00I'd start by tweaking the 68k resistor for the...I'd start by tweaking the 68k resistor for the base to ground.Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-19035406244249560722021-01-22T14:44:40.304-05:002021-01-22T14:44:40.304-05:00I have a Philips Valvo ASY29 NPN Germanium transis...I have a Philips Valvo ASY29 NPN Germanium transistor, hfe = 135. Would I be able to bias with the emitter resistor, or would also have to change the resistor leading to the bias of the transistor?Timothy Shieldshttps://www.blogger.com/profile/07390497645578046268noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-80634695136707046062020-10-14T09:56:27.016-04:002020-10-14T09:56:27.016-04:00Hi i built it with a 5k trimmer in place of 100ohm...Hi i built it with a 5k trimmer in place of 100ohm with ac179k.I can get to 6v at the collector.In full range it is ok but in the treble position i have a lot of noise..Is this normal or it depends on the transistor?ThanksBoukmanhttps://www.blogger.com/profile/15699313941924133575noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-46210318081113175732020-08-31T04:11:27.992-04:002020-08-31T04:11:27.992-04:00Thanks a bunch :)Thanks a bunch :)veggamanhttps://www.blogger.com/profile/07751313880464029024noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-91376225992499981442020-08-27T08:51:23.922-04:002020-08-27T08:51:23.922-04:00or like there https://effectslayouts.blogspot.com/...or like there https://effectslayouts.blogspot.com/search?q=royal+tone+benderZZOYDhttps://www.blogger.com/profile/17557567967251809829noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-14251399726252178432020-08-27T08:48:15.767-04:002020-08-27T08:48:15.767-04:00do like there https://effectslayouts.blogspot.com/...do like there https://effectslayouts.blogspot.com/search?q=katzenZZOYDhttps://www.blogger.com/profile/17557567967251809829noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-19396103031043396192020-08-23T17:43:56.426-04:002020-08-23T17:43:56.426-04:00Pleaaaaaas anyone !! :)Pleaaaaaas anyone !! :)veggamanhttps://www.blogger.com/profile/07751313880464029024noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-37436425539773467322020-08-18T17:54:48.989-04:002020-08-18T17:54:48.989-04:00Hi, how to put a pregain on this (like on the Anal...Hi, how to put a pregain on this (like on the Analogman Sunface) ?? What pot to use and how to hook it up? :)veggamanhttps://www.blogger.com/profile/07751313880464029024noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-43625335975982365382020-08-03T13:57:57.904-04:002020-08-03T13:57:57.904-04:00Built it! I used b500k & 4n7, 22n, 0.1 caps se...Built it! I used b500k & 4n7, 22n, 0.1 caps see there: https://imgur.com/a/VhD6eCm<br />68k bias i used 82k. ge npn mp38a hfe=90. Realy good working with fuzzes!ZZOYDhttps://www.blogger.com/profile/17557567967251809829noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-39763313838502754292020-03-13T15:01:00.850-04:002020-03-13T15:01:00.850-04:00This may be a dumb question but what voltage shoul...This may be a dumb question but what voltage should we bias the transistor to?mgnhttps://www.blogger.com/profile/04447753679989271874noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-4238453610997562252020-03-12T17:53:14.113-04:002020-03-12T17:53:14.113-04:00This comment has been removed by the author.mgnhttps://www.blogger.com/profile/04447753679989271874noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-2551021737637958742019-09-25T00:11:21.825-04:002019-09-25T00:11:21.825-04:00You aren't the only one. I bought a QC139 and ...You aren't the only one. I bought a QC139 and found that the orientation was backwards. I'll have to do some more fiddling with the resistor coming off the emitter, however, to determine if really needs to be reversed. TBD. collinlylecarterhttps://www.blogger.com/profile/05532387975640685018noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-5002243506270304362019-09-19T10:05:46.549-04:002019-09-19T10:05:46.549-04:00Pin 1 to emitter, pin 2 and 3 to groundPin 1 to emitter, pin 2 and 3 to groundFireproofhttps://www.blogger.com/profile/07133375580513440454noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-29232513541570266562019-09-19T10:01:01.455-04:002019-09-19T10:01:01.455-04:00How'd you wire the trimpot?How'd you wire the trimpot?Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-29102238983652234062019-09-19T09:38:34.816-04:002019-09-19T09:38:34.816-04:00Hi, I used an AC187 and placed a 10K trimpot inste...Hi, I used an AC187 and placed a 10K trimpot instead of the 100 ohm ground / emitter resistance, but the trimpot has no effect, the sound is always the same, any ideas? (I also put 100k and 220k in parallel instead of the 68k resistor)Fireproofhttps://www.blogger.com/profile/07133375580513440454noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-39106621891053918892019-08-30T13:06:06.349-04:002019-08-30T13:06:06.349-04:00Hi, I have an AC187, where you put the 3K resistor...Hi, I have an AC187, where you put the 3K resistor? tnks!Fireproofhttps://www.blogger.com/profile/07133375580513440454noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-73981660879286094012019-08-30T11:37:39.717-04:002019-08-30T11:37:39.717-04:00Use the 4007Use the 4007Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.com