Friday, 17 February 2012

Ibanez TS9

The other classic.  This again is as per the original.  Note, the layout has been done with 2N5088 or 2N3904 transistors in mind and that matches the orientation shown.  If you use anything else, check the required orientation for the transistors you use to make sure the pins are C B E from top to bottom.




Slightly more compact version with external switch which will give you stock TS808 clipping, red LEDs for a more aggressive distortion and a centre "diode lift" position which will be louder and cleaner than the other two positions:







BUY A KIT

38 comments:

  1. HI
    Whats the orientation of the JRC

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  2. If you look at the IC there is a faint semi circle at the top which represents this on the ICs:

    https://www.pc-control.co.uk/osc/images/8pin-dil-ic.jpg

    In my layouts, pin 1 will always be top left unless I note otherwise, and as far as I can remember I've only orientated ICs the other way once in the tap tempo daughter board, and in that case it was only because otherwise the two ICs would have needed to be linked diagonally right across the board.

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  3. i've built it but i notice that sound is attenuated with level pot to half and only in the final part the sound is boosted. is it normal?

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    1. try to put the transistor the other way around, it's shown the wrong way on the layout.

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  4. How does the LED+ connection work into the offboard wiring layout that you have on this site? Any help is appreciated!

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    1. LED+ goes to the anode of the LED. The cathode then goes to the 3PDT and is switched to ground when the the effect is turned on which illuminates the LED.

      In the offboard wiring layout there is a resistor in series with the wire to the LED anode, but with this layout the resistor is already included on the board so you don't have to put a resistor "in line".

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  5. If I wanted to take the LED out, do I just remove the 4k7 resistor?

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  6. Great stuff. Built this and after a little playing swapped the rightmost 1k resistor for a 2k2. Got a little more volume boost. My JCM800 is in hair metal heaven now, cheers :)

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  7. This comment has been removed by the author.

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    1. Well the circuit already has a pulldown resistor on the input and output, so the resistor between jack tips won't be adding anything. Just disconnect the LED and see if that is what is causing the popping

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    2. Tried disconnecting the LED, no effect, still popping. Also changed pulldown resistor values to a bigger one, no effect either. I think its not the pedal that causes popping.

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    3. I have had some noisy switches in the past but if you're getting popping it still suggests something in the circuit. Personally I would try a new switch but failing that it means starting to swap caps to see if you have one that is causing the issue

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  8. How do I adapt this for bassguitar? A friend of mine said he had a ts9 modded for bass many years ago...

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  9. Hi everyone. I just built the version with external switch but cannot get it to work properly. In bypass mode signal goes through without any problem (no noise or hum). When I engage the effect, there is a volume drop and the signal is very weak. The led lights up, and tone, gain and volume controls do what they should, but all in a very weak and low signal.
    So basically everything works fine but the signal is lost through the cricuit.
    Already teste IC and the trannies on other circuit and they are ok.
    Any thoughts? Thanks so much.

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  10. Ok, I just checked and I have 9v everywhere (all IC and transistor pins). It's got to be a short, right?

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    1. Ok, I was just being silly... these readings were made without any input and output jacks in the pedal. With the jacks, the readings are not so strange (I think):

      IC
      pin1: 4,44
      pin2: 4,6
      pin3: 4,6
      pin4: 0
      pin5: 4,45
      pin6: 4,44
      pin7: 4,43
      pin8: 8,97

      Q1
      C: 8,88
      B: 4,4
      E: 3,8

      Q2
      C: 8,8
      B: 0
      E: 0

      So something must be wrong with Q2. Any clues? Please, I need help and I need to learn.
      Thanks.

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    2. Tempted to make one of these or a couple...
      for clipping diodes, can you use germanium's? I have a few OA126's laying around and perhaps using sockets to play around with different diodes would be a good idea?
      I always liked old tube screamers but never got around to making one LOL

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    3. You can use whatever diodes you want for clipping, as each one will have a different "flavor" of distortion. Changing from Si to Ge will usually cause you to loose some overall output, due to the lower threshold, usually ~.60V for Si and ~.30 for Ge. The only satay to combat that is to replace each single Si with 2 Ge's in that direction. My suggestion is to socket the diodes and start experimenting. You don't have to commit to one immediately, and you can always change them later if you change your mind. Oh, and Ge diodes are said to be warmer and smoother then Si diodes when clipped.

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  11. Just building this (the modded version) but where does gain 3 go to or is not connected? Thanks in advance.

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  12. Gain 3 can be connected to Gain 2, or left unconnected. I'd just leave it unconnected

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  13. Ok built this a week ago and it sounds weird not what i was expecting. Checked build and everything seems fine. I am getting extreme fuzz but it breaks up almost immediately. I built the switch version. One thing i did wonder about was that 27n capacitor is it meant to be that value. I put a 22n and a 4n7 in parallel to get as close as i could. Could someone tell me if this 27n is correct? Should it be 47n or 22n and this is what is causing it too sound weird? Any advice would be greatly appreciated.

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    1. 20n or 22n is the correct value depending on the version of the schematic. That is just the input capacitor and bigger value just lets a bit more low frequencies in to the circuit. That cap does not contribute to your symptoms, no matter what the value is used.

      Things to double and triple check:
      1. Transistor and IC pinouts
      2. All component placement
      3. All cuts
      4. Run a knife through the stripe gaps and triple check for solder bridges
      5. Resistor values
      6. Power supply (or battery etc) output voltage

      If none of those yield results, then measure voltages from IC and transistor pins (multimeter black lead, or common lead to board grounds and red lead, or volt lead to the pins mentioned) and post the here. IC pins are numbered as such:

      1--u--8
      2------7
      3------6
      4------5

      Pins 1-3 and 5-7 should be close to "reference voltage", around 4,5 volts. Pin 4 should be zero and pin 8 should be the supply voltage, around 9V.
      +m

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    2. Thanks for the reply Miro. Checked everything and everything seems fine (apart from the gain pot only working in the last fifth).Here are the ic voltages
      1 - 4.66
      2 - 5.64
      3 - 4.58
      4 - 0
      5 - 4.87
      6 - 6.57
      7 - 4.88
      8 - 9.17

      Is this correct?

      Cheers

      G.

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  14. Hi friends! At the minimum level of the DRIVE pot the signal is never clean...is it normal? how could solve this problem?
    thanks a lot :D

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  15. I've tried this circuit vs. an original vintage ts9 and they are very different. the original has much more output volume and a much more "tube" response at low gain.
    Also the original has 20k tone pot and a 100k linear level pot.
    I used a RC4558P, in the original there is a TA75558P.....Transistors are K30A...What do you think about it?

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  16. Ok came back to this one after a break to see if i could sort it out and again spotted it nearly straight away. Had one resistor end in a wrong hole. Amazing how many times you can look at something and you just can't see it. Anyway sounding a hell of a lot better. Get a dip in vol when diodes engaged but i presume thats normal due to the voltage drop.

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  17. Works like a charm! Gratitudes lvlark!!!

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  18. hi friends, if I read: 3.3v on pin2, 5v on pin5, 0v on pin6 & 7.. what should I do the first checker? thanks?

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    1. This comment has been removed by the author.

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  19. its ok now after change the other 4558ic, sounds great,
    and thanks for the layout..

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    1. heres sharing my build..
      https://goo.gl/photos/XUvx4eeG9ogy6Ppx7

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  20. I made this pedal today and it sounds awesome. Thank you for this blog, Im gonna make a bunch of new pedals :D

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  21. Great pedal, but I am not getting any clipping from the red LEDs, it is like the switch is in the off position. When I swap them for other diodes, the switch works perfectly (I have put in sockets). So I have some excellent distortions, but am interested to hear the red LEDs clipping. Any ideas?

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    Replies
    1. Check if they are working with battery.I have bought some LEDs from tayda and the legs were very brittle. It looks like they are ok but at the top the legs might be broken.

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  22. Hey there !

    Built this effect, and it sound so great !!!

    Thx !

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