Iron Pumpkin(s) and other smaller vegetable animals

[ItsAllInMyHead]

^ All 680.

 

[Antealta]

Ok
Thanks

 

[Zen Mod]

my bad, edited value for one channel, not for second

all 680R

just shoot any question you have - either here or e-mail

 

[Antealta]

Ok

 

[Antealta]

That was a long day 😀

Double checking and adjustments tomorrow.

 

[Zen Mod]

Double checking

oh yeah!

 

[Antealta]

No smoke, adjusted all +12v,-12v. 0mv on all output + and -

It’s suppose to be -20mv on the R138-R238?

 

[Antealta]

I’m not getting any voltage into the reels, i have switches not logic, do I need to connect the ct tap ?

 

[Zen Mod]

It’s suppose to be -20mv on the R138-R238?

1R resistors at negative rail are there to measure voltage across each of them (resistor), so 20mV means buffer is set to 20mA of Iq

polarity of shown voltage depends of orientation of your DVM probes, and it is irrelevant

 

[Zen Mod]

I’m not getting any voltage into the reels, i have switches not logic, do I need to connect the ct tap ?

inputs switch (5step) is working with just flat cable

for 24-step volume switch, you need to have connected flat cable to Turtle, and two wires from MoBo

near input switch IDC header on MoBo, you have 2 pads marked as ATT+ and ATT-

logically, solder two wires there and to pads on switch, marked ATTSWITCH+ and ATTSWITCH-

 

[Antealta]

Ok good polarity is irrelevant.

But do I need the ic1 to get 24v out to attswitch+ and attswitch-
It says no ic1 when no logic, so I don’t have any there.

There is no voltage on attswitch

I have ≈32v out from rectifier

 

[Zen Mod]

you don't need 7805 (for logic 5V PSU) but you need LM317 with accompanying parts, for +24Vdc relay PSU

totally characteristically for ZM - IC1 is typo; it needs to be phrased as :

Relay/Logic PSU

if no logic, you don't need IC2

in that case 24Vac/10VA Donut

connected to AC1/AC2

like this:

 

[Zen Mod]

in your case - just LM317 on heatsink, no need to bother with Mica and bushing - just blob of thermal paste and bolt it directly to htsnk

 

[Antealta]

hehe 🤣
Part already ordered.

 

[Antealta]

I installed a lm317t and are getting 24.4v out from ATTSWITCH+, is that ok or little too high ?

 

[Zen Mod]

perfectly OK

 

[Antealta]

Ok
Thanks

 

[Zen Mod]

ref. to pic above

U=((3K3/180)+1)*Uref

as Uref is typ 1V25, but per datasheet and also in reality, in range of 1V2 to 1V3, everything is as predicted

but, most important - relays are perfectly happy with anything in range od 20-28Vdc, so just chill

and, voltage will practically sag for few hundred of millivolts when reg is actually loaded

 

[Antealta]

Ok
Learning something new everyday 😀
👍

 

[Antealta]

Thanks for the inventions of magnifier glass 😂