Announcement

Collapse
No announcement yet.

Preamp pcb interest

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Preamp pcb interest

    Right quick update on this.

    The board is done (yet to be tested, hopefully next weekend)

    Just checking how many people would actually want one + eq & di out pcbs.

    If its just a few I can provide trace masks to etch yourself or etch a few and post them out.

    For me to etch I'd hazard a guess at £20 for a full set as it's very time consuming especially drilling them by hand.

    Boost won't be included as that's personal preference. Of course you can just grab the preamp board itself too.

    Or if you don't mind waiting I will eventually do it all in eagle as I plan on selling these preamps. It's just a big faff.

    Recommended transformer spec is 125-0-125 @ 50mA - Hv

    3.15-0-3.15V @1.2A - filaments (this gives you headroom for trying other valves such as 6n2p) 1A is sufficient for 3x 12ax7

    0-14v @ 1A - for dc regulated supply for eq, boost etc can go higher up to 24v but be sure not to exceed 10v to the geq as it will fry the charge pump.

    You could also use something like the hammond 261c and a seperate transformer for the 15-24v.

    Attached the current layout to check it's readable/understandable for you guys. On the final documentation I'm going to have the accessory pcbs on seperate layouts to keep it simple. As below.
    Click image for larger version

Name:	Pre Update.png
Views:	170
Size:	1.02 MB
ID:	26345

    Click image for larger version  Name:	Focal Point EQ.png Views:	1 Size:	293.8 KB ID:	26343
    Last edited by Tony; 09-12-2021, 10:21 AM.

    #2
    Count me in. I’ve been wanting to do a kit build of
    sorts. Should be fun.
    Leon Today at 7:59 PM: Ripping farts is heaven

    Comment


      #3
      I’m in.

      Comment


        #4
        What's the timeline? I'm always interested in kits and shit to build, just want to get my Anvil built (~1-2 months while I wait for screen printing and fasteners) then I could maybe grab this and try some mods or something depending on how I like that.

        Comment


          #5
          Originally posted by JJ Rodriguez View Post
          What's the timeline? I'm always interested in kits and shit to build, just want to get my Anvil built (~1-2 months while I wait for screen printing and fasteners) then I could maybe grab this and try some mods or something depending on how I like that.
          Won't be a kit as such. Just pcbs, schematic & layout & recommended parts list.

          Doesn't make much sense shipping a load of parts overseas that are cheaper everywhere other than the UK!

          Just redrawing the schematic & renumbering things as the original had a lot of errors.

          I would say a few months most likely until everything is in place. Testing the board I should get done next weekend providing things to to plan.

          The only issue I can see people running into is the transformer as you either have to get a custom wind or use multiple. Antek most likely have something suitable.

          Comment


            #6
            Can also provide files to get faceplates etc

            Comment


              #7
              I have some copper clad board here, 3 oz, I suppose I could go the etching route, the issue is getting the layout on it. Guess I could go the old sharpie route. Anytime I get anything printed at Staples (drill templates, etc) they constantly scale it so it's fucked up and useless, even though I always specify no scaling, etc. Not ready to invest in a laser printer yet

              Comment


                #8
                Definitely tempted, do you have a ballpark indiciation of the UK costs of the other parts to see if it's something I'll want to go ahead with?

                £20 for the boards seems very cheap if you are drilling them by hand!

                Comment


                  #9
                  Originally posted by JJ Rodriguez View Post
                  I have some copper clad board here, 3 oz, I suppose I could go the etching route, the issue is getting the layout on it. Guess I could go the old sharpie route. Anytime I get anything printed at Staples (drill templates, etc) they constantly scale it so it's fucked up and useless, even though I always specify no scaling, etc. Not ready to invest in a laser printer yet
                  In theory they shouldn't be able to fuck this up as the work area is set exactly to A4 because Windows update kept fucking up my printer settings

                  Comment


                    #10
                    I'm just redrawing the schematic and doing a full BOM.

                    I'll have an accurate amount after.

                    The most expensive parts are the transformer at €70ish euros and the rack case at £53 buy you don't necessarily have to build it in a rack

                    Comment


                      #11
                      You underestimate the mouth breathers they have working there. They could fuck up an orgy in a whore house.

                      Comment


                        #12
                        Originally posted by JJ Rodriguez View Post
                        You underestimate the mouth breathers they have working there. They could fuck up an orgy in a whore house.
                        I used to use work printers before getting my own. You can grab them pretty cheap nowadays though. My dell 1130 was £27 costs more for replacement toner..

                        Another thing you can do with how i arranged things is just use tagstrips with jumpers. That's probably the path of least resistance
                        Last edited by Tony; 09-12-2021, 06:54 PM.

                        Comment


                          #13
                          You should be asking more $$$ for this.

                          Comment


                            #14
                            Originally posted by Randy View Post
                            You should be asking more $$$ for this.
                            It's my curse. I undercharge for everything.

                            I'm hoping to get the boards drawn up and made by pcbway/jl pcb to be honest as it's a pain drilling boards and takes forever.

                            But there's also the fact that I hate using Eagle. If anyone has any suggestions of software that's less picky/menu heavy that would be great.

                            Comment


                              #15
                              First draft of the schematic.

                              Need to go over the tonestack again (I nearly always draw them wrong)

                              This only has the full wave rectification on which will get a B+ of around 200vDC

                              Ill add the alternative bridge arrangement when I next get on the computer and also add notes for how to integrate the Geq etc *hint you literally put it right before the output.
                              Click image for larger version

Name:	Pre Schematic.png
Views:	132
Size:	166.3 KB
ID:	26451

                              Comment


                                #16
                                Originally posted by Tony View Post
                                just use tagstrips with jumpers. That's probably the path of least resistance

                                Comment


                                  #17
                                  I would be interested as well.

                                  Comment


                                    #18
                                    Originally posted by Tony View Post
                                    It's my curse. I undercharge for everything.
                                    Which is fine, I'm in the same camp. I get it, it's a bro-deal short run but your time is worth something. If its a few extra bucks but for morale's sake, it doesn't feel like slaving away to give them away for free, I'd say go for it; I'd like to see an incentive for you to do this again in the future because you've got great ideas.

                                    Sorry don't mean to fuck up this thread. Will be following, I'd also be interested.

                                    Comment


                                      #19
                                      Originally posted by Randy View Post

                                      Which is fine, I'm in the same camp. I get it, it's a bro-deal short run but your time is worth something. If its a few extra bucks but for morale's sake, it doesn't feel like slaving away to give them away for free, I'd say go for it; I'd like to see an incentive for you to do this again in the future because you've got great ideas.

                                      Sorry don't mean to fuck up this thread. Will be following, I'd also be interested.
                                      Not derailing at all. It's much appreciated to be honest. I always struggle with pricing things to be honest.

                                      Joyo, jet city etc undervalued everything and I found people getting offended at pricing etc.

                                      Not so long back I had someone have a paddy because I quoted them £850 for a jcm800 because they could get a wangs one for less than £400.

                                      If people don't mind waiting a bit longer I could actually do a better layout ( simpler wiring and through plated etc) and get boards professionally made which while stressful in drawing it up will be less time consuming overall personally.

                                      Comment


                                        #20
                                        Little bit of progress. Got the basic board done with options for full wave or bridge rectification.

                                        Now to add the pot wiring to the board edge and then update the silkscreen.
                                        Click image for larger version

Name:	Pre Render.jpg
Views:	101
Size:	87.7 KB
ID:	27275

                                        Comment


                                          #21
                                          Looks awesome man. If I had more (any) free time I'd love to grab one of these and give it a go.

                                          Comment


                                            #22
                                            Originally posted by Chris View Post
                                            Looks awesome man. If I had more (any) free time I'd love to grab one of these and give it a go.
                                            I know the feeling. I only had time to do that this morning because my son decided that he wanted to build a fortress with working drawbridges & portcullis so hes been occupied the last few hours.

                                            Comment


                                              #23
                                              Originally posted by Tony View Post

                                              I know the feeling. I only had time to do that this morning because my son decided that he wanted to build a fortress with working drawbridges & portcullis so hes been occupied the last few hours.


                                              Comment


                                                #24
                                                Honestly I find doing shit like this the actual wiring/soldering of components is the least time consuming thing. For me it's chassis preparation, etc that fucking takes forever and eats up all your time.

                                                At least from this side of it when you're not designing the thing

                                                Comment


                                                  #25
                                                  Originally posted by JJ Rodriguez View Post
                                                  Honestly I find doing shit like this the actual wiring/soldering of components is the least time consuming thing. For me it's chassis preparation, etc that fucking takes forever and eats up all your time.

                                                  At least from this side of it when you're not designing the thing
                                                  Chassis prep can be a nightmare especially on smaller chassis

                                                  Comment

                                                  Working...
                                                  X