Electro-Music Klee Sequencer Build and Applications Thread

Photon · Posted: Fri Oct 24, 2008 12:24 pm Post subject:

Well I finished building my Klee today. Unfortunately its not working. Sad

Upon applying power, pattern LED #16 alone lights up (in both pattern switch positions). However, flipping the invert B switch shuts it off. Pattern switch #16 is working according to my multimeter.

None of the other pattern LEDs will light after throwing pattern switches and pressing Manual Load.

any ideas? Sad

Pete

State Machine · Posted: Fri Oct 24, 2008 1:31 pm Post subject:

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

that is similar behavour to mine photon
except one side runs (except still no pattern switches)
perhaps you got 2 bad 4034s

im going to swap my dodgy 4034 in the next couple of weeks (finally) and will report back

Photon · Posted: Fri Oct 24, 2008 3:43 pm Post subject:

Thanks Bill

I'll run through the things you suggested. I don't think I'll be able to tonight, but hopefully before the weekend is over.

Excited to hear you're working on the Appendage! That thing has me foaming at the mouth.

Luka..Sorry to hear you're in the same boat. (Off Topic: tried etching yet?)

thanks guys

Pete

4034.jpg

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not too bad considering I'm holding a flashlight, keeping wires out of the way and trying to focus at the same time.

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State Machine · Posted: Fri Oct 24, 2008 6:14 pm Post subject:

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

no pete not yet
im looking into buying a laser printer at the moment
im think i may have found an ex-office a3 laserjet (for $5 Smile

)
and then ill gather some paper for testing and some aluminium scraps

do i have to make an aluminium bracket to hold the plate? it says somewhere that the bracket should be made from the metal you are trying to etch and i noticed you had a brass bracket. im not too sure how to make something from alu tbh. is there alu solder or something?

Scott Stites · Posted: Fri Oct 24, 2008 10:01 pm Post subject:

Scott Stites · Posted: Fri Oct 24, 2008 10:14 pm Post subject:

Here's the wiring for the Invert B.

I don't think this is the answer to all the prob's you're having, but I'd sure double-check it if Bit 16 goes off when invert B is flipped.

invertb_switch.PNG

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Scott Stites · Posted: Fri Oct 24, 2008 10:39 pm Post subject:

It's quite possible that if the invert B switch is wired up incorrectly, the ouput of U4 pin 11 (CD4093) could be fed directly back to pin 1 of U7 (CD4034) and that would illuminate the LED when the switch was in a particular position. Pin 11 of U4 will be high if the CD4034 is putting out 0V - its input is held low by R89 in that case, so its output would be high, and that high could be what is lighting the LED instead of the CD4034 (IE, the CD4034 may not be doing anything at all).

Once you've made sure that all is OK, then let me know if your clock LED is flashing with your clock input. On my Klee, on power-up I don't get a pattern load on power up until I've clocked the Klee at least once.

If your clock LED is flashing with the clock input, then check to be sure you are getting a clock signal at pin 15 of U6 and pin 15 of U7 (the two CD4034s). If you are, and you have another LFO, or any voltage source that will transition above two V and below, try sending an external load signal into the the external load jack. It could be, in this case, we might want to take a closer look at the load circuitry. The CD4013 (U5) handles this job, though it does require the circuitry before it to feed it a signal it can recognize. Sending an external load signal eliminates the manual circuitry for the time being and just concentrates on the main portion responsible for loading the patterns.

I think I may cover this portion in the rather truncated "Theory of Operation" thread.

Photon · Posted: Sat Oct 25, 2008 8:37 am Post subject:

Hey Scott
Thanks for the help.
Yup...the invert B switch was wired wrong. Good call. Cool

I tried externally clocking. It seems to work. The Rate LED flashes in time with the LFO (as do the gate bus 2 and master bus gate LEDs, (should they? Maybe I should double check all the wiring)). I haven't tried seeing if I have a clock signal at pin 15 of U6 and pin 15 of U7 yet. I'll get back to this when I can spend some real time.

Thanks again

pete

Scott Stites · Posted: Sat Oct 25, 2008 10:06 am Post subject:

Cool! Yes - I'd say both your master gate bus and gate bus 2 flashing at the same time is normal right now. If none of your pattern LEDs are lit, that likely means the CD4034s aren't putting out any bits. With no bits, that means no signal is reaching gate bus 1 or gate bus 3 regardless of how the gate bus switches are set. Gate Bus 2 is logical NOR, so if no signal is reaching gate bus 1 or gate bus 3, then gate bus 2 will put out a signal with each clock (neither 1 NOR 3 are high).

Master Gate Bus will always flash with the clock.

Take care,
Scott

Photon · Posted: Sat Oct 25, 2008 2:03 pm Post subject:

While looking over my wiring, I noticed that only one wire was connected to the Clock Enable switch (its wired to Clock input signal lug). There were no signs of a broken wire or even that the other lug ever had anything soldered to it. I wasn't sure how I had overlooked this, so looking through the build doc's I think I found a small error:
on page 35, it shows the above mentioned Enable Switch lug to Clock Input signal lug connection.
then on page 60, wire 2 of P102 cable is shown going to the Clock Input signal lug (not the other lug of the Clock Enable Switch).

I don't think this is the cause of my Klee's troubles at the moment, but it you may want to note it for a future rev. of the Build Docs.

apologies if this was already mentioned somewhere in this (or another) thread.

Scott Stites · Posted: Sat Oct 25, 2008 3:02 pm Post subject:

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

damn!

i finally got a new 4034 and it burnt out as soon as i put it in
it kinda worked for a minute then the LEDs flickered and it went back to the behaviour of how it used to work with a busted 4034.

why would it overload like this? any ideas
the circuitry seems find on either side of my 4034s as i can swap the living 4034 from socket to socket and the sequencer works accordingly. strange
what an anti-climax!

Scott Stites · Posted: Thu Nov 06, 2008 7:38 am Post subject:

Photon · Posted: Thu Nov 06, 2008 1:31 pm Post subject:

Ok-
I replaced the U6 & U7 (thanks Bill!) and rewired the invert B switch,
but the Klee still does not load a pattern.

So I've been going over my Klee with a fine tooth comb. I re-checked all wiring and cables and everything seems fine.

However...When I put my DDM on pins 1 and 2 of J1 (+V & digital GND; digital board) I'm reading about 60K (!) between those pins.
Then I checked the power and ground pins on all chips against their respective pins on J1 (on the digital board).
all read zero ohms except the U14 & U15 (the 2 LM324's)
a) pin 14 (U14 & U15) and pin 1 (of J1) reads 62K on both chips
b) pin 7 (U14 & U15) and pin2 (of J1) reads ~5k on both chips.
visual inspection reveals no shorts that I can see.

any suggestions?
thanks!!
Peter

Scott Stites · Posted: Thu Nov 06, 2008 1:58 pm Post subject:

So far you found two of the three sections that were corrected in build issue 5 Laughing

Photon · Posted: Thu Nov 06, 2008 2:08 pm Post subject:

Scott Stites · Posted: Thu Nov 06, 2008 2:20 pm Post subject:

Scott Stites · Posted: Thu Nov 06, 2008 2:24 pm Post subject:

BTW, all of the pulses we're looking for here should pulse low to high. The pins should be at 0V when there is no load signal.

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

Bill perhaps ill take you up on your offer to send one out

i'll PM you my details

Scott Stites · Posted: Thu Nov 06, 2008 5:56 pm Post subject:

Hmmm....OK. I know Bill may not have a chance to be around his computer here for a little while, so don't get alarmed if you don't hear from him for a little bit.

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

no problemo, ill audit the build again and see if there are any stuff ups

State Machine · Posted: Fri Nov 07, 2008 1:23 pm Post subject: