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Messages - teknoman2

#1
Yeah thats a bit odd, despite that check resistor values of R9, R10, R11 and last R12, R13.
#2
General Questions / Re: Flange Clock Basics
February 14, 2019, 09:26:38 AM
Check boss ce2 analysis for start.
Its the same concept in flanger, the only difference is the frequency clock which is higher.
https://www.electrosmash.com/boss-ce-2-analysis
#3
Post your voltages of the compander (v571).
You should have -4.7 volts on pin 7 of V571 and -13 volts on pin14 & pin15.

Gain 1 and Gain 2 trimmers affect the repeats.
If everything looks right, check the resistors after the compander till the FBK pot (r12,r14,r17,r19,r21,r25,r26,r27,r32,r33).
Cheers,
Panos
#4
Just saw your post.
I haven't find any solution yet for mine also.
I will measure my voltages also and let you know, but for my experience on other bbd analog delays that symptom indicates that there is something wrong with the compander.
Those j177 I believe are for the filtering only.

Panos
#5
Open Discussion / Re: Function f(x) - Newsletter
October 26, 2017, 10:00:59 AM
Sweet!!
Already signed.. ;)
#6
Usually same day or two is a reasonable amount of time.
Now the big concern for me at least is when your order is in your hands for (E.U based customers)
Mouser usually take 3 or 4 days after the order.
TME is the fastest and it takes one business day after the order.
Outside EU like OSH, smallbear or Tayda usually take longer which is totally reasonable.

I think when talking about DIY stuff, that most orders are below 100$ shipping time isn't a concern, at least for me.
If you want fast shipping you have to pay for it with all the customs and the taxes.
So I prefer wait a bit longer rather than paying the extra bucks for fast shipping.

Cheers,
Panos
#7
Open Discussion / Re: Engineer's thumb and JMK panner
September 27, 2017, 02:52:08 PM
Quote from: jubal81 on September 27, 2017, 02:24:46 PM
I'm suspicious it might be radio signal. Opamp inputs are very sensitive and those bias net traces become antennas, so it's important to keep the traces as absolutely short as possible.
thanx for the reply jubal81.
I know exactly what you mean, I was afraid of that..
Even when I put the backplate of the enclosure I had the same issue.
So you are saying that I must keep the bias net short as possible to eliminate this issue.

Since it's a dual layer pcb I was thinking, putting all the bias traces in first layer and the audio traces in the second.
Another thought is to make a dual pcb sandwich using pin headers, one for the mount knobs, power section and blend circuit
and the other one for the compressor section.

Or the simplest way is to keep the compressed signal as far as I can from the output jack.
#8
Open Discussion / Re: Engineer's thumb and JMK panner
September 26, 2017, 12:02:54 PM
Finally the boards arrived and populated.
The blend is working as expected the thing is that I ve faced two issues so far.
First one which is solved, I used TL072CN for all the opamps and the decay of the compressor was a distortion rather than a compressor.
I changed all of them with TL072CP and everything is normal. All the volatges are good and the compressor is working as expected.
Now the second issue that I can't find a way to solve it is so far is that when the ratio is above half way up ( I use a 500kA for the ratio pot) there is always static noise when I don't play anything.
I saw an old thread of aballen who post a video also.
Here it is.
https://www.youtube.com/watch?v=FQfFmRRfLJ0&app=desktop

In my build I don't have distortion only the static noise.
The noise appears after the 10k resistor of pin3 of OTA.
Since this is a very quiet comp does anyone know does this happening?
#10
General Questions / Re: Aquaboy weird distortion
July 22, 2017, 09:19:44 AM
Probably your compander isn't legit and that's why you ve got stragne voltages or heat.
Try swap it with a coolaudio v571 and measure again your compander voltages.
#11
IT Crowd was amazing..
I saw a couple months ago 11.22.63 which is based on Stephen King's book.
Also 13 reason's why and Stranger Things are my favorite so far.
#12
You have two options for that, in MBP_2017_v3 library use

a) BYP.2 option in supply pins directory.

b) use any pad in PADS. directory and rename it as in, out, 9v etc..
#13
Awesome!! I will make those changes and hope everything works great.  ;)
I will post my final impressions
#14
Thanx buddy for the answer really appreciate it.
You are totally correct regarding panner, it does have low input impedance, so I am thinking taking the high input impedance version of geofex to tame the tone loss.

http://www.geofex.com/Article_Folders/panner.pdf

Now regarding buffer after thumbs volume control, since thumbs output impedance is relative low does it really need a buffer?

#15
I ve got second thoughts regarding the emitter follower buffer after the volume control of the compressor.
I think its useless since the compressor by itself has low output impedance.
Also I did some tests using multisim, and I found out that Engineer's thumb doesn't flip the phase.
The input sinewave doesn't have 180 degrees phase comparing to the output.
Is that correct or am I missing something here?