Replies

  • David L. August 20, 2016 at 7:48am
    Like this.

    Just because I prefer to ground all pots and you have one wire less coming off the circuit board that can come loose. As you have already wired it up for this one just add the GND wire from the top right to the back of the guitar pot.

    image.jpeg

    • Jonno > David L. August 20, 2016 at 7:19pm
      Hi David. Thanx so much mate for taking time to give me some pointers. It seems veey quiet in this corner of Cigarbox Nation. The additional grounding info you gave and the pic are great. I am gonna start from scratch again. I think some of components i have are mismatched maybe. I have half watt and quarter watt resistors. Maybe that dont.matter. as for cap voltages i think i got enuff voltage ratings for them. Cheers. Jonno
    • Jonno > Jonno August 24, 2016 at 12:18am
      Thanx a bunch David and to the original poster of this thread. I have now a working pre amp and can start playing my cbg thru the computer and record using Reaper and a multitude of vst plugs. I found this challenging to make as I dont have soldering skills and due to a lot of tremoring I find fine hands work hard. Anywsy I used Wire Glue which I have used for other diy stuff like pickups. I use blobs of blue tac on a board to hold all components such as pots and jscks and the perf board for pre smp. I used the legs of each pre amp components to join together thus reducing glue points. Also when glueing have to be careful drops of glue dont drip onto another contact point and create a short. This is easy to do with the blue tac being able to hold a component at any angle to avoid errant drips. This website rocks.



      All up cost about 25 bucks for components and Wire Glue.
  • Henry S March 25, 2015 at 1:55pm

    This threads a bit old but I will chime in and say the classic Tillman preamp is one of the simplest to build it you just want a preamp - no pots or knobs. I've built several on perf board --- I'm going to build printed circuit board soon.

    http://www.till.com/articles/GuitarPreamp/

    • Jonno > Henry S August 15, 2016 at 10:32pm
      Old thread. I'm a noob with electronics. After joining this site I have learned to diy piezo and diy pickup stuff. But I now wanna play my cbgs thru a computer. Hence I need a pre amp of some kind. The last post in this thread before this one points to the tillman schematic. But apparently the fet is hard to get now. My questions are twofold. Can I get the fet tillman used in Australia? Secondly. Can you do point to point wiring and leave out a pcb board with any pre amp.If so could someone show in schematic how to do Tillman that way or the schematic at the top of this thread


      Hope someone can help me. Cheers. Jonno
    • Jonno > Jonno August 17, 2016 at 7:05am
      Well I've got all the parts now to make this. But I havent a clue about the connections that get made on the board. Anybody home!
    • David L. > Jonno August 17, 2016 at 9:18pm
      Hi Jonno,

      You seem to be overthinking it - the black lines in the drawing represent the electrical connections you need to make. You can do this in several ways - either by using the component wires (component legs) pushed through the perfboard and bent to make a connection you then solder to make it permanent, or you can solder a wire between component legs, or you can run a track of solder to make the connection.
      You push all components from the same side and do the soldering on the other side.
      Perfboard comes in different types - plain (so just holes in the board), with solder around the holes so soldering is easier, or with parallel tracks of copper wiring which can be cut to isolate part of the track or used to make some of the pathway of connections you need.
      What type of perfboard do you have?

      There are some videos on YouTube (just search "soldering perfboard"). Capacitors easily overheat making a point to point circuit tricky to make and the circuit without the backbone of a perfboard would easily bend causing numerous short circuits.

      If you google "Tillman preamp" and click onto the images option you will see the Tillman preamp as a circuit diagram, the one above and one on perfboard with the parallel copper strips. These might help you get more of a feel for the circuit.

      I am in the UK so about to turn in for the night. If you need to ask further questions I will check tomorrow and try and answer them if nobody else has already done so.

      Regards,
      David
    • Jonno > David L. August 17, 2016 at 11:16pm
      Hi David thanx for response. I got parts for the pre amp using the mpf102 fet as I couldnt get j201 used in Tillman. I showed guy at store the pic at the head of this thread and he gave me board with copper surrounding the holes.Called it proto board or something.As far as capacitors go I couldnt work out from this thread which type to get so I just got the little green ones which are polyester. Are they ok or do I need electrolytic ones that are mentioned for Tillman pre amp?

      Cheers. Jonno
    • Jonno > Jonno August 18, 2016 at 3:03am
      To clarify the capacitors. I have an electrolytic cylindrical one for C1 10 uf.I have a green polyester one for the C2 0.1 uf And the C3 100pf is a brown ceramic one. The guy at the store asked about voltages. But how the heck would I know. I believe there is a formula out there somewhere that you can work out capacitor voltages you need. Im as thick as two bricks when it comes to this stuff. But I want to give it a shot with some tips.
    • Jonno > Jonno August 18, 2016 at 7:55am
      Hmm. The more I look at the pic of wot goes where it is becoming clearer to me what to do. I need advice on those capacitors I mentioned though.
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