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still works fine with no changes since 2014

Four months on and the start/stop has failed. I had a 103 ,10000pf, cap handy so soldered this to C2. WORKS.

The Gate and Trigger both show 10v using a scope.

Typo error in previous post of mine. A 103 cap is 10 add on the 3 zeros and you get 10000pf not 1000pf as I stated earlier.
This is now irrelevant ...

No more issues it all works Very Happy

The last fault, no gate and trigger out, was caused by a the GCOM wire being loose on the first gate switch. Now re-soldered and everything works correctly.

On ...

It's still got issues.(' Laughing

') - I know CV outs are working as I got scope peaks and meter voltages. Built a simple 555 VCO, to voice the pulses.
Have had 30 minutes of fun actually listening to it ...

Not the greatest scope images... first shot is D18k and pin14 4017. It shows about +10v. Second shot shows D18 anode, about +10v and -12v. The volt/div is 0.5 and the time/div is 10ms.

One last que ...

SUCCESS IT WORKS! Very Happy

.

Looked at u3b again,soldered a 22 swg wire to pin 5 , licked my fingers and pressed on exposed end of wire - got automatic sequencing. So I am supplying e ...

I am going look at specs for TL072, check what I have used against other brand specs. Can't see why my issue would be the 40106 at this stage, though comparing a 'TI' to a 'Fairchild' I see a lot of d ...

Thanks for input Chartreuse-J, I have looked at your post several times over the past couple of months.
I tried Peters idea with C5 :

C5 is shown as 1nF. I wonder if that is in fact marginal. I'd ...

Thank you both for input need to get back to you asap.
I am still trying to find the time to investigate your recent feedback. I scoped D18k as it goes straight to pin 14 of the 4017. In start mode t ...

A distraction. I looked into poor vertical trace on oscilloscope, in short I think my scope has a fault which is why the pulse(s) in the scope shots are so faint. I believe its still just usable. I ra ...

Images to support previous post.

So pin 7 U3 I am getting -12v/+5v scope reading. Same reading for D18 anode, cathode is +5v, pin 14 U1 is also +5v.

Just checked scope manual I had the volt/div fine tune red, inner dial, set wrong, so it is now all the way clockwise. Now getting correct scope readings, so readings in previous scope image set shoul ...

Scope is 10x setting.
Measured, using scope, pin 4 0f U3 showing -5.5v and pin 8 +6.5v.
However using meter I got -12v on pin 4 and +12v on pin 8.

Used meter to check output of bench supply and ...

I have some scope images, still new to using the scope!
I have set the horizontal to centre line by using scopes ground setting then I switched to scopes DC setting. The volts/Div was set at 0.5. Th ...

I'm working on it

btw I have still got -12v on pin 7 U3 not + 12 volts.

So its stuck stuck, but I need +12v to trigger pin 14 of 4017 into sequencing. Right? The question is why I am not getting +12v. Right?

Ray ...

Thanks for replies Smile

Have checked some things as follows.

D16 and D18 anodes are identical, used scope.

Pin 7 U3 direct to pin 14 of 4017 does not auto sequence, however pin 1 U3 direct to pin ...

Using scope the gate Q11 is showing short strong pulse, D18 cathode is showing same pulse but weaker or not as bright.

The source of Q11 shows the same waveform as U3 pin 1. D18 anode shows the s ...

Have remeasured D18 voltage correctly,didn't think my logic was right... I have made no more changes to pcb since last post. The last component I swapped was D17.

So Voltage on D18 anode (with co ...

Reply to your last posts,

Peak voltage at U31 is 6v.
R23, R29, R28 and R32 are all correct.
Pin 6 U3 reads 8.14 volts.
Peak at U3, is this pin 7 ? It is -12 volts.
D14 is the correct way round ...

Have placed uninsulated tweezers, on each of R23, C2, R29 and pin 5 U3b, ends where these all meet on circuit. (guessing I am acting as ground) on each of the four locations I have automatic seque ...

I have Just put the probes either side of C2 10pf to measure it, I know this is a questionable practice when a cap is in circuit. I got automatic sequencing. Again power from the meter?
C2 the ceram ...

Hi I have checked out some of your suggestions.
I Have ran a wire direct from U3a pin 1 to 4017 Pin 14 and automatic sequencing works!! at any clock rate setting. Very Happy

D18 anode side shows 30 to 40 m ...

Author	Message
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Fri Jun 03, 2016 12:45 pm Subject: Still working Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	still works fine with no changes since 2014
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sun Oct 05, 2014 5:46 am Subject: C2 again Subject description: changed cap value Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Four months on and the start/stop has failed. I had a 103 ,10000pf, cap handy so soldered this to C2. WORKS.
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Tue Jul 08, 2014 12:05 pm Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	The Gate and Trigger both show 10v using a scope. Typo error in previous post of mine. A 103 cap is 10 add on the 3 zeros and you get 10000pf not 1000pf as I stated earlier. This is now irrelevant ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sun Jul 06, 2014 11:32 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	No more issues it all works The last fault, no gate and trigger out, was caused by a the GCOM wire being loose on the first gate switch. Now re-soldered and everything works correctly. On ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sat Jul 05, 2014 10:11 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	It's still got issues.('') - I know CV outs are working as I got scope peaks and meter voltages. Built a simple 555 VCO, to voice the pulses. Have had 30 minutes of fun actually listening to it ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sat Jul 05, 2014 7:15 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Not the greatest scope images... first shot is D18k and pin14 4017. It shows about +10v. Second shot shows D18 anode, about +10v and -12v. The volt/div is 0.5 and the time/div is 10ms. One last que ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sat Jul 05, 2014 4:23 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	SUCCESS IT WORKS! . Looked at u3b again,soldered a 22 swg wire to pin 5 , licked my fingers and pressed on exposed end of wire - got automatic sequencing. So I am supplying e ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sat Jul 05, 2014 12:33 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	I am going look at specs for TL072, check what I have used against other brand specs. Can't see why my issue would be the 40106 at this stage, though comparing a 'TI' to a 'Fairchild' I see a lot of d ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sat Jul 05, 2014 12:07 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Thanks for input Chartreuse-J, I have looked at your post several times over the past couple of months. I tried Peters idea with C5 : C5 is shown as 1nF. I wonder if that is in fact marginal. I'd ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Wed Jul 02, 2014 1:08 pm Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Thank you both for input need to get back to you asap. I am still trying to find the time to investigate your recent feedback. I scoped D18k as it goes straight to pin 14 of the 4017. In start mode t ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Tue Jul 01, 2014 12:52 pm Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	A distraction. I looked into poor vertical trace on oscilloscope, in short I think my scope has a fault which is why the pulse(s) in the scope shots are so faint. I believe its still just usable. I ra ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sun Jun 29, 2014 1:05 pm Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Images to support previous post.
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sun Jun 29, 2014 11:56 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	So pin 7 U3 I am getting -12v/+5v scope reading. Same reading for D18 anode, cathode is +5v, pin 14 U1 is also +5v.
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sun Jun 29, 2014 11:25 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Just checked scope manual I had the volt/div fine tune red, inner dial, set wrong, so it is now all the way clockwise. Now getting correct scope readings, so readings in previous scope image set shoul ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sun Jun 29, 2014 10:13 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Scope is 10x setting. Measured, using scope, pin 4 0f U3 showing -5.5v and pin 8 +6.5v. However using meter I got -12v on pin 4 and +12v on pin 8. Used meter to check output of bench supply and ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sun Jun 29, 2014 6:45 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	I have some scope images, still new to using the scope! I have set the horizontal to centre line by using scopes ground setting then I switched to scopes DC setting. The volts/Div was set at 0.5. Th ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Fri Jun 27, 2014 1:05 pm Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	I'm working on it
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Tue Jun 24, 2014 2:35 pm Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	btw I have still got -12v on pin 7 U3 not + 12 volts. So its stuck stuck, but I need +12v to trigger pin 14 of 4017 into sequencing. Right? The question is why I am not getting +12v. Right? Ray ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Tue Jun 24, 2014 1:19 pm Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Thanks for replies Have checked some things as follows. D16 and D18 anodes are identical, used scope. Pin 7 U3 direct to pin 14 of 4017 does not auto sequence, however pin 1 U3 direct to pin ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Mon Jun 23, 2014 11:05 pm Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Using scope the gate Q11 is showing short strong pulse, D18 cathode is showing same pulse but weaker or not as bright. The source of Q11 shows the same waveform as U3 pin 1. D18 anode shows the s ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Mon Jun 23, 2014 2:14 pm Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Have remeasured D18 voltage correctly,didn't think my logic was right... I have made no more changes to pcb since last post. The last component I swapped was D17. So Voltage on D18 anode (with co ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sun Jun 22, 2014 2:02 pm Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Reply to your last posts, Peak voltage at U31 is 6v. R23, R29, R28 and R32 are all correct. Pin 6 U3 reads 8.14 volts. Peak at U3, is this pin 7 ? It is -12 volts. D14 is the correct way round ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sun Jun 22, 2014 6:27 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Have placed uninsulated tweezers, on each of R23, C2, R29 and pin 5 U3b, ends where these all meet on circuit. (guessing I am acting as ground) on each of the four locations I have automatic seque ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sun Jun 22, 2014 5:30 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	I have Just put the probes either side of C2 10pf to measure it, I know this is a questionable practice when a cap is in circuit. I got automatic sequencing. Again power from the meter? C2 the ceram ...
Topic: MFOS 10 Step Sequencer not sequencing
Cato Replies: 71 Views: 42275	Posted: Sun Jun 22, 2014 5:11 am Subject: MFOS 10 Step Sequencer not sequencing Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Cato Replies: 71 Views: 42275	Hi I have checked out some of your suggestions. I Have ran a wire direct from U3a pin 1 to 4017 Pin 14 and automatic sequencing works!! at any clock rate setting. D18 anode side shows 30 to 40 m ...