Home Forums GuitarPCB Build Support Apollo Tremolo – no effect

Viewing 17 posts - 1 through 17 (of 21 total)
  • Author
    Posts
  • #5854
    fr4nck
    Participant

    Hello,

    I’tried to build Apollo Tremolo with care, reading the building document. I’m pretty sure that I’ve made a mistake…

    Could you help me to find where? I took pictures and made a short video, as you can see now.

    Video: https://youtu.be/-ObGkiml6RY

    If you have any good ideas, thank you, I’m trying to find sounds with my jamman and audioprobe…

    Cheers

    Franck

    Ps: I’m new, but i built Swah, Tube Screaming Ultra and love them 🙂

    #5856
    Cybercow
    Moderator

    fr4nck – I would venture a guess that there is a wiring issue. Double-check that the HOT signal wires to and from the PCB are connected to the pads directly next to the little “T” that is screen printed on the input and output points on the PCB. I tried to examine the photos provided, but I was unable to make out to what connection points they terminate.

    The video “sounds” to me like the PCB is not getting any signal input, but the output ‘sounds’ as tho it is correct because of the noise indicators as you adjust the pots.

    Cybercow

    #5858
    Barry
    Keymaster

    Agreed Verify the Wiring and be sure the T pads on in and out match the Wiring Guide. We can’t tell from photos. Finally we cannot guarantee an xvive opto couplet will match the specs of the NSL-32. You would need to compare both datasheets. It would be very important that they match.

    #5859
    fr4nck
    Participant

    Cybercow: The video “sounds” to me like the PCB is not getting any signal input, but the output ‘sounds’ as tho it is correct because of the noise indicators as you adjust the pots.

    Yes, that’s why I made it 🙂

    I’ve been reading the document, “in” and “out” wires seem to be in the right places (or maybe I’m wrong?) as you can see with these pictures.

     

    I made another video with my audioprobe… if you have two minutes to watch it 😛 I did not test condos for now:

    https://www.youtube.com/watch?v=pRliPUdJd8o (it sounds clipping but when music plays it was completely clean)

    #5861
    fr4nck
    Participant

    Barry: Finally we cannot guarantee an xvive opto couplet will match the specs of the NSL-32. You would need to compare both datasheets. It would be very important that they match.

    This is it: https://www.musikding.de/VTL5C2_1 and there’s no datasheet on xvive’s website…

    Even if it was not the good octo couplet? The buffer should play?

     

    #5862
    Cybercow
    Moderator

    fr4nck – based on your probing video, there is NOTHING happening on side A of IC1 (output stage of the circuit), but there is signal passing thru side B of IC1 (first audio stage of the circuit). That suggests either the opamp is bad – OR – something is wrong with one or more components associated with the final output stage of the circuit.

    #5863
    Barry
    Keymaster

    The T-Pad for the Out appears correct.

    If this is a kit from Klaus then he has verified the Xvive.

    #5866
    fr4nck
    Participant

    Barry: The T-Pad for the Out appears correct.
    If this is a kit from Klaus then he has verified the Xvive.

    This is not a complete kit. I bought pieces separatly because I had one of them.

    Klaus use this list: https://www.musikding.de/docs/guitarpcb/apollo_bom_en.pdf and I used Apollo’s doc :-/ maybe Cybercow found another possibility? 😉 (I hope I won’t have to buy another octo haha..)

    I’ve found datasheet.. but I don’t know with what I’ve to compare.. https://www.thonk.co.uk/Documents/xvive/Xvive5C2%20Non-RoHs.pdf

     

    Cybercow: based on your probing video, there is NOTHING happening on side A of IC1 (output stage of the circuit), but there is signal passing thru side B of IC1 (first audio stage of the circuit). That suggests either the opamp is bad – OR – something is wrong with one or more components associated with the final output stage of the circuit.

    Should I pay more attention to C2 C3 R4 before considerating thate IC1 won’t “Stire it up” ?

    I replaced IC1 by another (ne5532P instead of TL072 like I just saw in Klaus’s list) and it’s the same.

    #5869
    fr4nck
    Participant

    Is Ron and Roff are the only difference or I’m wrong? (I’m new in electronic 🙂 )

    source for NSL-32: https://html.alldatasheet.fr/html-pdf/205826/SILONEX/NSL-32/293/1/NSL-32.html

    Another really short video to ear what I ear from the output… https://youtu.be/8s8AlI503cw

    #5873
    Cybercow
    Moderator

    fr4nk – it appears the “On” and “Off” resistances are not close to matching.

    #5874
    fr4nck
    Participant

    Another really short video to ear what I ear from the output… https://youtu.be/8s8AlI503cw

    (as i just edited the last post I add it here 😛 )

    #5875
    Barry
    Keymaster

    I am placing a photo here of a working build that shows all parts clearly and off-board wiring so you may use it to compare against yours. I do this since you have hands on.

    If that does not help we will needs to compare voltages of all IC pins so you will need to post your voltages. I am helping my daughter move today but others are always around to help.

    #5877
    fr4nck
    Participant

    Thank you Barry!

    Do you think I should replace the xvive? Because I just received new pcb from you, and I have to buy pieces from musikding for them. Did you see the video?

    Thank you too for my bonus 🙂

    I have now to build Dr Phype, D’Lay, MoRC and EAT. I hope I’ll be more lucky with components.

    #5878
    wilkie1
    Moderator

    Check the orientation of the opto-coupler.  I think you have it installed backwards.  The LED leads need to be facing up on the photo and the + lead must be placed on the pad marked +.

    #5886
    fr4nck
    Participant

    Wilkie1: Check the orientation of the opto-coupler. I think you have it installed backwards. The LED leads need to be facing up on the photo and the + lead must be placed on the pad marked +.

    It’s true!! I welded it as it is done with it’s pins spread on one side and tight on the other.
    It is now in the right direction, and… No sound effect too. Could it be broken?

    Maybe I should try another audio tests with my audioprobe.

    #5887
    wilkie1
    Moderator

    Measure the voltage at the + terminal of the Opto-coupler.  In one position of SW2 you should be reading a varying voltage and in the other position you should read a steady voltage (set by the BLEVEL pot).  If you have voltages, then probe for a signal at IC1B pin 7 and then at R17 and then at IC1A pin 1.  Report your findings.

    #5891
    fr4nck
    Participant

    Octo-coupler voltage at the + terminal :

    • Sw position 1: 3.96 > x <3.97 (no changes even if i turn gain pot)
    • Sw position 2: 2.54> x <4.89

    probe ic1:

    1. Oscillation
    2. Oscillation
    3. Oscillation
    4. Oscillation
    5. no sounds
    6. Oscillation
    7. Oscillation
    8. Oscillation

    All oscillations sounds have small differences

    Probe ic2:

    1. no sounds (short click when i plug in)
    2. seems to have sounds but “bitchushed” only when sample sound’s level is heavier
    3. music from source
    4. Oscillation
    5. no sounds
    6. no sounds (only a short bump/buzz when I plug in my pin)
    7. no sounds
    8. no sounds

    probe R17: only a short clic when i plug.

    Thank you, for your help, good evening I’ll be back tomorow 🙂

    Time to sleep here!

    See you

    Franck

     

Viewing 17 posts - 1 through 17 (of 21 total)
  • You must be logged in to reply to this topic.