Search found 309 matches

by Pav
Sat Nov 14, 2020 8:23 am
Forum: Oakley Sound Systems
Topic: Question about the Oakley Bus
Replies: 6
Views: 224

Re: Question about the Oakley Bus

Oh and page 7 vrg user guide describes the Oakley bus implementation ..
by Pav
Sat Nov 14, 2020 8:18 am
Forum: Oakley Sound Systems
Topic: Question about the Oakley Bus
Replies: 6
Views: 224

Re: Question about the Oakley Bus

Plug in v/oct or gate breaks connection to bus. See vrg user guide as an example of gate normalisation being documented. You could confirm on schematics too.
by Pav
Sat Oct 31, 2020 11:21 am
Forum: Music Tech DIY
Topic: maplin 5600s headphone amp -current draw
Replies: 4
Views: 158

Re: maplin 5600s headphone amp -current draw

tried replacing the big Capacitor and then LM383 but it has not fixed the problem.
by Pav
Tue Oct 27, 2020 3:12 pm
Forum: Music Tech DIY
Topic: maplin 5600s headphone amp -current draw
Replies: 4
Views: 158

Re: maplin 5600s headphone amp -current draw

Thanks Mike - Honking i will add to my diy synth vocabulary :-)
Ill give the cap replacement a try. I do have 1 LM383 left to try too.
by Pav
Tue Oct 27, 2020 11:27 am
Forum: Music Tech DIY
Topic: maplin 5600s headphone amp -current draw
Replies: 4
Views: 158

maplin 5600s headphone amp -current draw

Hi, I have a puzzling problem with one of the 2 mono headphone amps of my maplin 5000s drawing too much current and heatsink getting too hot. I had used the BY73Q kits from Maplin in UK based on 5 pin LM383T as recommended then. These are described on p38 of build guide: http://www.bygonebytes.co.uk...
by Pav
Tue Oct 13, 2020 5:53 pm
Forum: Oakley Sound Systems
Topic: How to keep the sequencer in "tune" with a separate oscillator
Replies: 8
Views: 416

Re: How to keep the sequencer in "tune" with a separate oscillator

Hi, The way your question is posed may need a tiny clarification to see what your really asking but I'll give it a go. Both the keyboard and the sequencer generate a controlling voltage into the 1 volt per octave input of their respective oscillators. You tune / calibrate the oscillators to respond ...
by Pav
Tue Aug 25, 2020 3:19 pm
Forum: Oakley Sound Systems
Topic: Best Oakley filter for Maplin synth.
Replies: 6
Views: 391

Re: Best Oakley filter for Maplin synth.

Thanks Tom,Tony, A dedicated thread for 5600s would be useful yes. Re zeners I had replaced the original zeners with fresh zeners before you mentioned this. Not because they were faulty. Never had any issues with them, presumably as I never shorted the rails. There is a sensing circuit that shuts th...
by Pav
Tue Aug 25, 2020 9:51 am
Forum: Oakley Sound Systems
Topic: Best Oakley filter for Maplin synth.
Replies: 6
Views: 391

Re: Best Oakley filter for Maplin synth.

I am interested in any mods recommended as I have my 5600s PCBs out of the case for re capping and rewiring..starting to wish I hadn't started. Lots of wires. Anyway I'm calibrating vcos now on the bench without mixer. Voltages according to manual "could" go as high as 12v if key modulation is patch...
by Pav
Fri Aug 07, 2020 11:54 am
Forum: Oakley Sound Systems
Topic: euro envelope gate stops working
Replies: 3
Views: 253

Re: euro envelope gate stops working

its back in the 6U case and working. I checked the power lead and it appeared firmly connected at both ends. put back panel back on, and fired up...and voila. The duff joint idea makes sense. I will also double check the power consumption of the modules i have one row of 10 and one of 8. The psu pan...
by Pav
Fri Aug 07, 2020 10:57 am
Forum: Oakley Sound Systems
Topic: euro envelope gate stops working
Replies: 3
Views: 253

Re: euro envelope gate stops working

Aha - Solved by reseating the main pcb with pot pcb . Phew!

But wait . Spoke too soon. It works in my mini doepfer case, but not when put back in my 6U case powered by Oakley euro PSU.
by Pav
Fri Aug 07, 2020 10:44 am
Forum: Oakley Sound Systems
Topic: euro envelope gate stops working
Replies: 3
Views: 253

euro envelope gate stops working

Hi Tony, its been a while -thought id get in touch, and hope you are coping well with lock downs and the like up there in Cumbria. Should have seen the beach down here on south coast nr bournemouth today. Too busy for me at 9am to get my usual post walk coffee and be comfortably "social distanced", ...
by Pav
Fri Jun 26, 2020 5:02 pm
Forum: Music Tech DIY
Topic: First time DIY synth builder and dreadbox Antiphon
Replies: 10
Views: 604

Re: First time DIY synth builder and dreadbox Antiphon

Oh and it's more common in builds I have completed at least to have a single tempco aligned lengthwise so body sits centrally on top of ic.
by Pav
Fri Jun 26, 2020 4:56 pm
Forum: Music Tech DIY
Topic: First time DIY synth builder and dreadbox Antiphon
Replies: 10
Views: 604

Re: First time DIY synth builder and dreadbox Antiphon

Well done for having a working build. A little thermal paste applied with a matchstick or similar to avoid messy application should solve the tempco issue. I managed without by bending and putting the leads in pcb first, then retracting them to get the body of tempco just to cover the ic by a couple...
by Pav
Mon Jun 15, 2020 6:28 pm
Forum: Music Tech DIY
Topic: First time DIY synth builder and dreadbox Antiphon
Replies: 10
Views: 604

Re: First time DIY synth builder and dreadbox Antiphon

With the antiphon, getting the correct orientation of sockets was my build mistake. Solder joints especially ones to the earth plane of the pcb are the main culprit of problems once built. Particularly a problem with this kit. Also because there are a lot of resistors, there's a danger of inserting ...
by Pav
Mon May 11, 2020 5:18 pm
Forum: Music Tech DIY
Topic: Std Res resistors
Replies: 11
Views: 540

Re: Std Res resistors

Thanks Whoop_ John, Good to hear from you.
by Pav
Sun May 10, 2020 11:55 am
Forum: Music Tech DIY
Topic: Std Res resistors
Replies: 11
Views: 540

Re: Std Res resistors

KSS, EatYourGuitar, thanks for your words of wisdom. Luckily there are only a few instances of std vs min for me to think through. I have taken the Psu first to check, and there is a std res 1k for a resistor to a led where resistor is connected to +20v dc rail. The led calculator suggests 1k 0.6W. ...
by Pav
Sat May 09, 2020 6:10 pm
Forum: Music Tech DIY
Topic: Std Res resistors
Replies: 11
Views: 540

Re: Std Res resistors

Thanks emmaker. That helps me.
by Pav
Sat May 09, 2020 10:46 am
Forum: Music Tech DIY
Topic: Std Res resistors
Replies: 11
Views: 540

Std Res resistors

<t>I'm refurbing my 1979 Maplin 5600s and seeking some confirmation..Std Res resistors are occasionally stated in BOM. Is there an implicit higher power rating assumed like 0.6w?? One instance in bom explicitly asks for 2% Std Res which I read as better than min Res which would have been 5% carbon. ...
by Pav
Sat May 02, 2020 5:22 pm
Forum: Eurorack Modules
Topic: Moog Mother 32 VCA Voltage
Replies: 7
Views: 434

Re: Moog Mother 32 VCA Voltage

The only difference in my test patch was frequency knob at 12 o'clock . I retested with it at full ccw. At the lowest octave the voltage flatlined with just clicks audible. But moving up the octaves it never exceeds +-5 v ..maybe 5.5 ..I'm using intellijel 1u scope module. So I'm wondering if yours ...
by Pav
Fri May 01, 2020 1:26 pm
Forum: Eurorack Modules
Topic: Moog Mother 32 VCA Voltage
Replies: 7
Views: 434

Re: Moog Mother 32 VCA Voltage

My two m32s tested with sustain on to keep vca open and volume full clockwise both exhibit +/-5v I'm afraid. I have just upgraded to v2 firmware prior to testing for you. Could it be your scope being the diva? Or it's probe setting. I tested with square pulse .
by Pav
Fri May 01, 2020 12:57 pm
Forum: Eurorack Modules
Topic: the Oakley Classic VCA...i KNOW i bang on about it, BUT....
Replies: 49
Views: 4949

Re: the Oakley Classic VCA...i KNOW i bang on about it, BUT....

I have built two of these successfully and for me a definite improvement on previous euro Classic vca.
by Pav
Fri May 01, 2020 12:42 pm
Forum: Eurorack Modules
Topic: Moog releases 2.0 firmware for Mother-32
Replies: 16
Views: 1317

Re: Moog releases 2.0 firmware for Mother-32

Upgrade for me was very smooth and worked first time on two m32s. +1 to Moog.
by Pav
Thu Apr 23, 2020 9:25 am
Forum: Oakley Sound Systems
Topic: PA-20 Voltage query
Replies: 6
Views: 774

Re: PA-20 Voltage query

Pm replied to
by Pav
Wed Apr 22, 2020 3:27 pm
Forum: Oakley Sound Systems
Topic: PA-20 Voltage query
Replies: 6
Views: 774

Re: PA-20 Voltage query

Thanks for the caution on pa20. I have replaced all zeners and diodes with fresh ones, replaced the tantulums with regular caps. Whilst the 2200uf caps look fresh,replaced with quality ones. Do not know if I should replace the rest. There was no specific fault on the psu ...just age, and not that ma...
by Pav
Tue Apr 21, 2020 8:10 am
Forum: Oakley Sound Systems
Topic: PA-20 Voltage query
Replies: 6
Views: 774

Re: PA-20 Voltage query

This is the 5600S variant of ETI ...build guide says 1979...but I built @85 I would only use PA20 with one synth at a time...and at first on the bench with only the load of a couple of boards. The stated max expected current draw from other boards is 300ma per rail. Unlike modular, it has +/- 14 , +...

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