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Iron Pumpkin(s) and other smaller vegetable animals, Tips 'n' Tricks thread
Iron Pumpkin(s) and other smaller vegetable animals, Tips 'n' Tricks thread
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Old 9th April 2019, 10:50 AM   #21
Zen Mod is online now Zen Mod  Serbia
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Iron Pumpkin(s) and other smaller vegetable animals, Tips 'n' Tricks thread
Quote:
Originally Posted by noelectrix View Post
ZM, two dumbs i have so far : )

–what relays do we have for SE, 12V or 24V?
(i ask because of IC 7812/7824 on switch)

–issit for 5 different sources? I count 5 Realys on board, but (vaguely remember) 6 dots for 6 sources on your build.

best
stefan(o)
you got relays , so see what's written on them , Dodo

adequate 78xx is already on switch board , while for channel boards - choose accordingly zenner diode a nd that's it (16V for 12V relays , 27V for 24V relays)

catch is that I sent few first packages with 24V relays and later I resorted to 12V relays as final solution

5 sources ; switch having 6 positions , first most left is Mu state ........ in western vocabulary , known as Mute

proper AC feed for Turtle switch PCB still need explanation (edit in first post)
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Last edited by Zen Mod; 9th April 2019 at 10:52 AM.
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Old 9th April 2019, 11:15 AM   #22
noelectrix is offline noelectrix  Europe
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Quote:
Originally Posted by Zen Mod View Post
you got relays , so see what's written on them , Dodo
i looked for vaporetto ship venice to lipzia (where the relays are), but there isn´t any : )

tnx!
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Old 9th April 2019, 11:18 AM   #23
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Iron Pumpkin(s) and other smaller vegetable animals, Tips 'n' Tricks thread
no Porn , no Glory

in da Pub , not here
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Old 16th April 2019, 09:20 PM   #24
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Iron Pumpkin(s) and other smaller vegetable animals, Tips 'n' Tricks thread
If I get:

Iron Pumpkin preamplifier(s) kits #5, without AVC...Put volume pot on front and Jenson transformer from F6 on tail, will this work with approx. 6 dB gain?

If yes, what pot in terms of 10K, 25K or 50K?

Which Cinemag model transformer would be better?

AVC just out of price range, will need to wait and use cheaper alternative version in mean time if it will work?

Idea from:

The F4 is a jewel... and seems underestimated

post # 26 of William2001.


Russellc
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Old 16th April 2019, 09:55 PM   #25
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Iron Pumpkin(s) and other smaller vegetable animals, Tips 'n' Tricks thread
yup

see post #2 , mid pic , two points most left - TP and TW ; that means Pot Top (CW lug) and Pot Wiper (mid lug)

so - exacto knife , cut between two pads , and you can resort to Iron Pre configuration , which is Selector - Pot - Buffer - Autoformer ( if you need/want it) - Out RCA

will it sing ...... Proud ZM sez - you bet!

Autoformer of your choice ..... I covered popular types in Iron Pre thread

edit: if my Iron Turtle is out of present price range , you can buy Intact audio 200$ AVC jobbies and implement them instead of Turtle , using mechanical switch and plenty of wire/wiring work

take care of having exactly that type - easily implemented for gain in same manner as Turtle , other (also more expensive ones) are not so easy or even totally incompatible for wiring them for gain
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Old 16th April 2019, 11:58 PM   #26
Russellc is offline Russellc  United States
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Iron Pumpkin(s) and other smaller vegetable animals, Tips 'n' Tricks thread
I know from William2001's post that Jenson from F6 will work, but cinemag and others have tons of transformers. For Cinemag, is same one I ordered for SissySit/M25 correct also, or different model number needed? What about standard Edcor as in M2? I also have those on hand, or is another model from Edcor better for this use?

I dont know beans about transformer!

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Old 17th April 2019, 05:16 AM   #27
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Iron Pumpkin(s) and other smaller vegetable animals, Tips 'n' Tricks thread
ok , it isn't so short thread ( linked one) and I wrote types of xformers there ..... but anyway - for this purpose you're looking at any of these (Edcor , Jensen , Cinemag) made as classic 600:600 repeater coils (named in Yore, telephone developing times)

so - if you need it strictly to drive F4 with full swing - use same one as in M2 (Edcor 600:15K) , if you want "just" 6db of gain - take same looking one Edcor , but choose 600:600 from drop menu on same page

for Jensen - use same one as in F6 - JT-123-FLPCH ( I believe there is also iteration with wires instead of PC pins, called slightly different)

for Cinemag - same one as in Sissy (DEFiSIT , SIT-3) , where you can choose two types of laminates (50%Ni-50%FeSi) CMOQ-4LPC and (100%Ni) CMOQ-4HPC

from accumulated experience .......... I would choose now - Edcor from M2 for full blast, and Cinemag 4HPC for 6db of gain


and yes - each of 600:600 jobbies - if having CT in primary - can be wired from 4V/V gain , which is 12db of gain
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Last edited by Zen Mod; 17th April 2019 at 05:20 AM.
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Old 28th April 2019, 09:35 AM   #28
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Is there a BOM or components spec available?
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Old 28th April 2019, 10:38 AM   #29
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Iron Pumpkin(s) and other smaller vegetable animals, Tips 'n' Tricks thread
Ok,will make a list tonight
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Old 28th April 2019, 09:18 PM   #30
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Iron Pumpkin(s) and other smaller vegetable animals, Tips 'n' Tricks thread
Default Iron Pumpkins BOMs .... well sort of

Quote:
Originally Posted by sov View Post
Is there a BOM or components spec available?
sort of - do not expect that I'm going to include purchase links , simply because I'm not operating that way

besides - whatever project is in case , I'm always making parts list from schematic , doing schm analyze in same time ...... result of years of doing same thing over and over , trying to grasp how something is actually working ..

general notes :

-all resistors are plain common peasant 0207/600mW Metal Films

-all zener diodes are tiny flimsy plain common peasant ones (500mW)

-all trimpots are multiturns with set screw on top , pins in line ; if you got from me ones with zig-zag pins , just use tweezers to line them ...... who's gonna bother with that details anyway

ask if you have more questions , of course
Attached Files
File Type: txt Iron Pumpkin SE BOM.txt (13.7 KB, 38 views)
File Type: txt Iron Pumpkin BOM.txt (17.7 KB, 24 views)
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