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Just about to order some parts for this but the BC557C is obsolete. Is there a specific replacement I should be using? I read about the 2N3906 but for this particular application I'm not sure.

I' ...

You may double the value of C7 and C8 and use 100uF for C1 and C2, and add a small 100nF cap in parallel.
Using ferrite beads instead of R1 and R2 would also greatly improve the rejection of the HF n ...

You may double the value of C7 and C8 and use 100uF for C1 and C2, and add a small 100nF cap in parallel.
Using ferrite beads instead of R1 and R2 would also greatly improve the rejection of the HF n ...

Hi Gary,

Thanks a lot man, your help has been invaluable, and now the VCO is working perfectly well.

I replaced R23 100k by 82K as Yves suggested and that worked a lot better than the 100K one, ...

Can I use electrolytic to replace those 1uF unpolarized??

Hi Dodecasonico, I guess you can (not so sure if that's the best option), you should put it with the negative towards the output. The best ...

Hi Gary,

Thanks a lot man, I can't believe is so hard to trace this fault.

Yes, C8 reads in one leg 4.58V in the other one 0.99V.

With the VCO turned off, across C8 I have like 40 ohms, almo ...

After an isopropyl cleaning, it looks a lot better and as you can see on above readings are now much better (specially after replacing the faulty power cable , I guess I ruined it after pulling it so ...

Hi forum ,

As a newbee in diysynth I was wondering ;

Has someone already made gerber-files from the pcb's ??
Yves shares those ( THANK YOU !! ) as pdf files , but I hope someone already conv ...

Hi Gdavis,

Thanks a lot for your help.

PSU Voltage in the power connector in the VCO were : -14.98v +14.96v
I fixed that now they are +15.00v -15.00v

My PSU is very simple, a toroid 240v to ...

Hi Gdavis,

Thanks a lot for your help.

PSU Voltage in the power connector in the VCO were : -14.98v +14.96v
I fixed that now they are +15.00v -15.00v

My PSU is very simple, a toroid 240v to ...

Hi Gdavis,

Thanks a lot for your reply.

I recalibrated it and I discovered that something is wrong, SIN is almost like TRI in the scope no round peak at all and voltages are too low:

(Scope s ...

Alright, here it was my fault, I set Pulse Width Potentiometer in -5 during the process of calibration , instead of setting it in 0 (zero, middle position) so the Pulse wave was hidden by the voltage ...

Looks like you've done a pretty good job so far. If SAW and TRI look good, the core should be OK. Lets try to narrow it down some more by probing U6 pins 8, 9 and 10. Look for the following:

pin ...

Hi guys,

I have this Yusynth VCO, and seems to work fine apart from PULSE out which is like a flat line in the scope, and no sound is coming out.

What I already did was checking the whole PCB fo ...

Author	Message
Topic: New module at yusynth.net : Quadrature VC-LFO
JRC4558D Replies: 54 Views: 65766	Posted: Mon Apr 25, 2016 2:01 am Subject: BC557C Subject description: replace it by a BC560C it will work perfect. Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 54 Views: 65766	Just about to order some parts for this but the BC557C is obsolete. Is there a specific replacement I should be using? I read about the 2N3906 but for this particular application I'm not sure. I' ...
Topic: Faint hum in Steiner VCF - is this normal?
JRC4558D Replies: 11 Views: 12423	Posted: Wed Mar 16, 2016 3:48 am Subject: Re: Faint hum in Steiner VCF and Minimoog VCF * FIXED * Subject description: C7 and C7 replaced by 1000uf caps... Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 11 Views: 12423	You may double the value of C7 and C8 and use 100uF for C1 and C2, and add a small 100nF cap in parallel. Using ferrite beads instead of R1 and R2 would also greatly improve the rejection of the HF n ...
Topic: Faint hum in Steiner VCF - is this normal?
JRC4558D Replies: 11 Views: 12423	Posted: Wed Jan 27, 2016 9:55 am Subject: Faint hum in Steiner VCF and Minimoog VCF Subject description: C7 and C7 replaced by 1000uf caps... Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 11 Views: 12423	You may double the value of C7 and C8 and use 100uF for C1 and C2, and add a small 100nF cap in parallel. Using ferrite beads instead of R1 and R2 would also greatly improve the rejection of the HF n ...
Topic: VCO - strange fault SORTED, READ the post please
JRC4558D Replies: 14 Views: 11676	Posted: Wed Oct 14, 2015 3:13 am Subject: Sorted! Subject description: Problem was R23. Solution a 68K resistor instead of the 100K or 82K. Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 14 Views: 11676	Hi Gary, Thanks a lot man, your help has been invaluable, and now the VCO is working perfectly well. I replaced R23 100k by 82K as Yves suggested and that worked a lot better than the 100K one, ...
Topic: Noise generator Sample & Hold - Alternative to "yellow caps"
JRC4558D Replies: 7 Views: 7605	Posted: Tue Oct 13, 2015 3:51 am Subject: electrolytic cap Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 7 Views: 7605	Can I use electrolytic to replace those 1uF unpolarized?? Hi Dodecasonico, I guess you can (not so sure if that's the best option), you should put it with the negative towards the output. The best ...
Topic: VCO - strange fault SORTED, READ the post please
JRC4558D Replies: 14 Views: 11676	Posted: Tue Oct 13, 2015 3:34 am Subject: Readings and pics Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 14 Views: 11676	Hi Gary, Thanks a lot man, I can't believe is so hard to trace this fault. Yes, C8 reads in one leg 4.58V in the other one 0.99V. With the VCO turned off, across C8 I have like 40 ohms, almo ...
Topic: VCO - strange fault SORTED, READ the post please
JRC4558D Replies: 14 Views: 11676	Posted: Sun Oct 11, 2015 1:17 pm Subject: PCB clean Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 14 Views: 11676	After an isopropyl cleaning, it looks a lot better and as you can see on above readings are now much better (specially after replacing the faulty power cable , I guess I ruined it after pulling it so ...
Topic: gerber files
JRC4558D Replies: 6 Views: 8197	Posted: Sun Oct 11, 2015 4:48 am Subject: Re: gerber files Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 6 Views: 8197	Hi forum , As a newbee in diysynth I was wondering ; Has someone already made gerber-files from the pcb's ?? Yves shares those ( THANK YOU !! ) as pdf files , but I hope someone already conv ...
Topic: VCO - strange fault SORTED, READ the post please
JRC4558D Replies: 14 Views: 11676	Posted: Sat Oct 10, 2015 6:26 am Subject: Re: Voltages are all wrong... Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 14 Views: 11676	Hi Gdavis, Thanks a lot for your help. PSU Voltage in the power connector in the VCO were : -14.98v +14.96v I fixed that now they are +15.00v -15.00v My PSU is very simple, a toroid 240v to ...
Topic: VCO - strange fault SORTED, READ the post please
JRC4558D Replies: 14 Views: 11676	Posted: Sat Oct 10, 2015 5:11 am Subject: Voltages are all wrong... Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 14 Views: 11676	Hi Gdavis, Thanks a lot for your help. PSU Voltage in the power connector in the VCO were : -14.98v +14.96v I fixed that now they are +15.00v -15.00v My PSU is very simple, a toroid 240v to ...
Topic: VCO - strange fault SORTED, READ the post please
JRC4558D Replies: 14 Views: 11676	Posted: Fri Oct 09, 2015 12:55 pm Subject: New reads after trying a new calibration Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 14 Views: 11676	Hi Gdavis, Thanks a lot for your reply. I recalibrated it and I discovered that something is wrong, SIN is almost like TRI in the scope no round peak at all and voltages are too low: (Scope s ...
Topic: VCO - strange fault SORTED, READ the post please
JRC4558D Replies: 14 Views: 11676	Posted: Fri Oct 09, 2015 8:55 am Subject: Now Pulse Works Subject description: it was a misunderstanding of Pulse Width Knob Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 14 Views: 11676	Alright, here it was my fault, I set Pulse Width Potentiometer in -5 during the process of calibration , instead of setting it in 0 (zero, middle position) so the Pulse wave was hidden by the voltage ...
Topic: VCO - strange fault SORTED, READ the post please
JRC4558D Replies: 14 Views: 11676	Posted: Thu Oct 08, 2015 12:20 pm Subject: VCO - strange fault SORTED, READ the post please Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 14 Views: 11676	Looks like you've done a pretty good job so far. If SAW and TRI look good, the core should be OK. Lets try to narrow it down some more by probing U6 pins 8, 9 and 10. Look for the following: pin ...
Topic: VCO - strange fault SORTED, READ the post please
JRC4558D Replies: 14 Views: 11676	Posted: Thu Oct 08, 2015 7:02 am Subject: VCO - strange fault SORTED, READ the post please Subject description: CV tracking is perfect, SAW, TRI and SIN outs are ok, no PULSE. Forum: DIY Hardware and Software » YuSynth
JRC4558D Replies: 14 Views: 11676	Hi guys, I have this Yusynth VCO, and seems to work fine apart from PULSE out which is like a flat line in the scope, and no sound is coming out. What I already did was checking the whole PCB fo ...