tag:blogger.com,1999:blog-8559314700259794131.post8563766562844145095..comments2024-03-16T17:35:18.893+01:00Comments on Eddy Bergman.com: Synthesizer Build part-1: SYMMETRICAL POWER SUPPLY (1,5A) with independent voltage adjustment.Eddy Bergmanhttp://www.blogger.com/profile/13286799069112368259noreply@blogger.comBlogger53125tag:blogger.com,1999:blog-8559314700259794131.post-83008163910859146682023-06-17T14:21:19.575+02:002023-06-17T14:21:19.575+02:00Yeah I dont know why I didn't consider this ea...Yeah I dont know why I didn't consider this earlier on, It has been going strong for quite a while now at about 30 modules but i can imagine it overheating to its death soon so I'll unplug some things when I play it until I have a second supplyTimhttps://www.blogger.com/profile/18270474139946317284noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-26906444411469186752023-06-17T14:07:00.894+02:002023-06-17T14:07:00.894+02:00Over 30? Yes it would be a good idea to build a se...Over 30? Yes it would be a good idea to build a second powersupply. I have about 15 modules hanging from each of my powersupplies. Every row has its own supply and I have a temperature meter connected to the heatsink of one of the LM317's and that goes to 65 degrees Celcius quite fast. Then it switches on a fan and then the temperature goes down again and the fan switches off again. So it goes on and off. That's not necessary though. Just something I built in ^____^ Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-74204892026809579262023-06-17T13:58:27.248+02:002023-06-17T13:58:27.248+02:00I don't know how much current each of my modul...I don't know how much current each of my modules draw, but i'm over 30 modules deep right now, I guess it would be smart to build a second supply or one of those transistor current boosters right?Timhttps://www.blogger.com/profile/18270474139946317284noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-11924384610693328912022-12-12T21:31:33.599+01:002022-12-12T21:31:33.599+01:00Okay thanks. This is a weird problem. I hope you c...Okay thanks. This is a weird problem. I hope you can fix it.Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-78573798419184146912022-12-12T21:19:26.290+01:002022-12-12T21:19:26.290+01:00It's 18V... Checked everything, measured every...It's 18V... Checked everything, measured everything. I will check the internet for more info. If I find something that solves it, I will let you know :)Tonhttps://www.blogger.com/profile/05024285632727603616noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-55758555951965738642022-12-12T20:53:48.379+01:002022-12-12T20:53:48.379+01:00This is a difficult one. They must be a mistake ma...This is a difficult one. They must be a mistake made somewhere because these layouts have been used by som many people now. It's simply the datasheet circuit I'm using. Are you sure your transformer has enough over voltage? For instance to get 12V out you can't get away with putting 12V into the voltage regulators. The input voltage needs to be about 3 volts higher than what you want the output to be.Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-6945272474292530312022-12-12T20:02:10.936+01:002022-12-12T20:02:10.936+01:00Yes, I also ran all my modules on another powersup...Yes, I also ran all my modules on another powersupply from a diy mixer I built years ago. It has a much smaller transformer and everything ran really well. I built more supplies and I never had a problem like this.. Could the problem be due to the 2 trimmer circuits? The circuit is very straight forward so I have no clue at this moment.Tonhttps://www.blogger.com/profile/05024285632727603616noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-81894064134566168892022-12-12T17:59:54.150+01:002022-12-12T17:59:54.150+01:00Are you sure the transformer can deliver the right...Are you sure the transformer can deliver the right power?Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-19867407058596494882022-12-12T16:42:44.420+01:002022-12-12T16:42:44.420+01:00Unfortunately I have the same problem as those I r...Unfortunately I have the same problem as those I read in the thread...I rimmed the pots to a perfect + and -15v. When I hooked up a vco I first thought that the vco was broken. So when a load is connected the power drops a lot . I guess one vco doesn't pull much power. I have no clue. Everything is connected in the right way. I checked it many times.Tonhttps://www.blogger.com/profile/05024285632727603616noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-58913304192783283132022-12-08T08:41:36.371+01:002022-12-08T08:41:36.371+01:00Thank you so much! Yes I set most designs up with ...Thank you so much! Yes I set most designs up with enough space for changes. That makes troubleshooting easier too, when necessary. :)Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-32375879557356038872022-12-07T23:49:37.926+01:002022-12-07T23:49:37.926+01:00Thanks! And thanks also to put all this info out i...Thanks! And thanks also to put all this info out in the open. I like your designs. They are changeable. Every time I order parts they have different dimensions as the ones I see in your pictures so its nice that there is room for change :)<br />Tonhttps://www.blogger.com/profile/05024285632727603616noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-15345173995204433332022-12-07T18:01:11.843+01:002022-12-07T18:01:11.843+01:00Hi Ton. You can indeed leave those 10µF caps out. ...Hi Ton. You can indeed leave those 10µF caps out. They are used as added protection for the voltage regulators (see fig. 17 of the LM317 datasheet pdf) but they are totally not needed for a synthesizer powersupply and they are not in the schematic either. I guess I put them in to test it, I can't remember anymore. I'll make a note in the article that they can be left out. Thanks for drawing my attention to it! I'm glad everything works so well.Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-45308863383719773912022-12-07T17:02:04.007+01:002022-12-07T17:02:04.007+01:00Hi Eddy, I already build some modules from your de...Hi Eddy, I already build some modules from your designs and they work really fine. I just built the power supply. I noticed that there are caps of 10uF over the two pots. I only see them in your first layout. What is their function? The supply seems to be working fine without them.Tonhttps://www.blogger.com/profile/05024285632727603616noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-86277637639587126882022-01-20T19:51:58.057+01:002022-01-20T19:51:58.057+01:00Hi Jim. That looks great! I'm glad you got it ...Hi Jim. That looks great! I'm glad you got it working without any problems. A separate powersupply is very handy. That way you can also use it to test new projects. I built myself a separate dual powersupply too and included a Thomas Henry VCO (the first one I built) as a function generator and an LFO for frequency sweeps. Now I have a complete desk top function generator slash powersupply for testing. :)Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-41542478402516452852022-01-20T19:37:51.868+01:002022-01-20T19:37:51.868+01:00Hello Eddy,
I've made a start and nearly fini...Hello Eddy,<br /><br />I've made a start and nearly finished this power supply, using bits I'd already got. Worked first time I'm pleased to say. https://photosynthvideo.blogspot.com/p/power.html It'll be in a separate box and connected to the case with a 3 pin 12mm Aviation plug and socket.<br /><br />Cheers and many thanks - JimJim Readhttps://www.blogger.com/profile/02683274430082130404noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-3049160799129975152021-07-10T08:49:41.388+02:002021-07-10T08:49:41.388+02:00There are stripboard layouts for the WASP filter o...There are stripboard layouts for the WASP filter online. I won't start building again at least until autumn. I'm having a little summer stop.<br />Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-83183460914703495932021-07-10T08:39:31.602+02:002021-07-10T08:39:31.602+02:00Sweet! I have the doepfer Wasp but would like to b...Sweet! I have the doepfer Wasp but would like to build it and compare them Sammyhttps://www.blogger.com/profile/03298088030294890103noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-80470914202407457052021-07-08T12:19:47.286+02:002021-07-08T12:19:47.286+02:00I think I will do w WASP filter in the near future...I think I will do w WASP filter in the near future. I'm curious too. :)Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-2224444244641709392021-07-07T23:56:07.246+02:002021-07-07T23:56:07.246+02:00Have you thought about doing a wasp filter layout?...Have you thought about doing a wasp filter layout? I’d be super hyped on that! Stoked on building what you have available too but I’d be very excited if there was a wasp filter buildSammyhttps://www.blogger.com/profile/03298088030294890103noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-9166319074805853572021-07-07T23:53:11.347+02:002021-07-07T23:53:11.347+02:00I realized that I have a meanwell rt-65b which is ...I realized that I have a meanwell rt-65b which is +/-12v and also has a 5v output so I’ll just use that since I already have it. Was originally intended to put in a eurorack case but I can just order another when I get the motivation to pull all the modules and modify the case. Problem solved!Sammyhttps://www.blogger.com/profile/03298088030294890103noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-46901702100894575882021-07-06T08:53:11.753+02:002021-07-06T08:53:11.753+02:00No you need one with three secundary wires, like: ...No you need one with three secundary wires, like: 2 x 15V ACEddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-3998467186785855962021-07-06T05:09:36.344+02:002021-07-06T05:09:36.344+02:00I don’t mind buying a transformer due to the conve...I don’t mind buying a transformer due to the convenience of it coming to my door step would this do? <br />Jameco Valuepro 112512.-R Power Transformer, 24 VAC 2 Amp 117 VAC Wire Leads https://www.amazon.com/dp/B00B8865AC/ref=cm_sw_r_cp_api_glt_fabc_DFR4Q4MSPB4SS5M2H861Sammyhttps://www.blogger.com/profile/03298088030294890103noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-9259341437928153762021-07-05T18:01:16.539+02:002021-07-05T18:01:16.539+02:00Hi Sammy, that's alright, I deleted the other ...Hi Sammy, that's alright, I deleted the other two identical remarks. As for a powersupply I can recommend. There are some good kits available on eBay. I recently got one of these for a project and they work very well. It's got dual voltage and you can set the voltage with a trimmer. https://www.benl.ebay.be/itm/LM317T-LM337T-317-337-Power-Supply-Dual-Voltage-Regulator-Adjust-Board-Kits-L-/232981506790?hash=item363ec7aae6<br /><br />You can find similar kits all over the internet. You do need a good transformer though with minimal 2 x 15 Volt with a center tap but you can get those from old radios or stereos at second hand shops. I never buy new transformers.Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-83734485610680160402021-07-05T17:53:01.738+02:002021-07-05T17:53:01.738+02:00Hi Eddy, I’m planning on building many of the modu...Hi Eddy, I’m planning on building many of the modules on your site and have been building up a decent stock of parts but would rather buy a power supply. Is there one that you can recommend to me? Sammyhttps://www.blogger.com/profile/03298088030294890103noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-10249431931268613092021-06-03T19:42:29.964+02:002021-06-03T19:42:29.964+02:00Yes of course as long as you have a transformer th...Yes of course as long as you have a transformer that has a 120V primary winding then there's no problem. Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.com