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Messages - gabrielnbr

#1
Open Discussion / Re: EMS synthi Hi-Fli repair
May 07, 2019, 01:21:41 AM
Quote from: digi2t on April 18, 2019, 02:34:05 PM
Diode boards are on their way.  :)



Thanks to Phil for his monk-like work.

Hello,

got some diodes to test today! The ones on this board are SOD-323-2 or SOD-123-2? Both SOD-80 (mini Melf) and SOD-123 have manageable size for hand soldering even without a hot air station, just need some solder paste and the superficial tension of the melted tin pull the part to the correct place.

Thanks
Gabriel
#2
Open Discussion / Re: EMS synthi Hi-Fli repair
April 29, 2019, 02:46:46 PM
Quote from: digi2t on April 29, 2019, 10:43:42 AM
Quote from: PMowdes2 on April 29, 2019, 06:50:35 AM

All parts of the LM13700's are used.  The original unit used 3080's

The only place we used a 3080 was where we had a stray single and I didn't want redundant pins by using a 13700.

The preamp is in the pedal on the original, we wanted to keep it as close to original spec as we could, also there isn't much spare room on either of the large pcbs so it made sense.

As Phil stated, it was a question of not wasting. Not wasting pins, or space. We're maxed out here on the Hammond "small" enclosure scale. As for the preamp, again, we're respecting the original form, and what the previous sentence points out.

9 years! Wow! Holy moly... I would never have waited for that long. Screw that. :o

Fully understood the choices!

About the waiting time, well I was in the beginning of a project to build one, but as you know there is very little information and the repair manual available could not be fully read.

I had redone almost half of the service manual pages from scratch, maybe you had interest in using that on the building documentation (specially the settings part) let me know and I can rush to finish that for you.
#3
Open Discussion / Re: EMS synthi Hi-Fli repair
April 29, 2019, 03:36:27 AM
Hello,

signed to the forum just to congratulate everyone involved in the process!
I am on position #30 for the Digitana Reissue - and there goes almost 9 years in the process.
For sure I am up for some PCBs (my father already told me he wants me to build one for him too).

Have some questions too.

1. Is there any reason for using mixed LM13700 and 3080 instead leaving half LM13700 disconnected?
2. Since the output is already on the main enclosure, would be a bad idea to enclose the preamp there too? Leaving only the CV circuit on the pedals. This way it could be built like a standalone box if you do not want the CV pedal for making changes on the fly.

Congrats again, the work is really incredible .