What's wrong with the kiss, boy?

[Russellc]

Started without coffee....large mess up! What am I thinking!

What is quick and dirty way to rig an input?

Russellc

 

[Zen Mod]

if you think of enabling relay , that's easy - explained earlier in thread , few days ago

14 pins IDC connector : short pins 1 and 3 for input 1

1 to 5 for input 2

1 to 7 for input 3

1 to 9 for input 4

1 to 11 for input 5

 

[6L6]

Use the K1 inputs

Jumper header position 1 to position 3

 

[DiyFan]

Thanks to 6L6 I was able to get these balanced boards. I plan to use them with my Serbian Balanced Lightspeed volume control. Also, thank you Zen Mod for this great project!

Just got my parts, time to build them!

 

[Russellc]

Use the K1 inputs

Jumper header position 1 to position 3

Whoops....per phone call I thought we decided jump #2 and #4 to turn on relay #1?

Russellc

 

[Russellc]

if you think of enabling relay , that's easy - explained earlier in thread , few days ago

14 pins IDC connector : short pins 1 and 3 for input 1

1 to 5 for input 2

1 to 7 for input 3

1 to 9 for input 4

1 to 11 for input 5

I have 2016 boards if that matters, per phone call with Jim, I should connect #2 and#4 to turn on one...however in post above, slightly different #723...add to that I did all this with no coffee (nice dark Sumatra now) combined with professional level ability to destroy anvil with rubber hammer

 

[ItsAllInMyHead]

Check your schematic, and check your board with a DMM. Per the schematic you sent me, pins 3 and 4 are electrically the same. Pins 1, 2, 13, and 14 are electrically the same. Take your pick.

 

[ItsAllInMyHead]

Edited to add - just read back a bit... trust Jim, and ZM... and very sorry to hear about your blown cap!

 

[Russellc]

Have trusted them for many years...also well aware of my propensity to mess up perfect info. Now to go hunt up a volume pot for temp use. Think 50K would work? Usually go with 25K but this one is right here...can change later if needed.

Russellc

 

[ItsAllInMyHead]

Sorry - I meant trust them over me... I failed to read back that they already answered you. DOH!

Yep, both will work just fine if you're not using (some) tube sources. Pick your fave. BTW - I learned that from Jim and ZM.

 

[Zen Mod]

25K OK

50K OK

troubles with interconnect cable capacitances are starting little more up

 

[Russellc]

I've been searching for 2 hours at least for those two 50k Pots! Had them in hand just a week or two ago. I guess I could wire it "potless" for now, use computer for source and it's volume. The hunt continues.

Russellc

 

[Russellc]

Found them!

Russellc

 

[Zen Mod]

 

[DiyFan]

I got the Gemini shunt sections soldered up and tested with load resistors. I was only able to get a max of +/- 11v regulated out of them. After trouble shooting I realized I got 2.5v lm336’s instead of 5v.

Does anyone think I should order replacements or can I swap out the upper voltage divider resistors R10 and R7 for a higher value, say ~100k?

 

[Zen Mod]

alter voltage divider, see what's value of LTP resistor (error correction amp) in Iron Pumpkin , where I did use 2V5 ref.

if you point me at your actual schm. I'll be more precise

btw. with shunt regs you don't need shunt res. for testing; final shunt element (mosfet) must be able to do all work

 

[DiyFan]

I am using all the values from this schematic except for U1 and U2 where I used 2.5v instead of 5v ones. With my limited knowledge I was thinking I could up the R10 and R7 values to get voltage division lower?

Thanks for tip on load resistors, I won't bother tacking them on for second board I test!

 

[Zen Mod]

for 2V5 reference, change:

R17,R18 - 820R

R8,R9 - 2K7 to 3K9, whatever you have in drawer

 

[Zen Mod]

Russ, is it working by today ?

or you are busy with Orthodox Easter, too ?

 

[Russellc]

Russ, is it working by today ?

or you are busy with Orthodox Easter, too ?

No, heating Iron now to put volume pots in the works. Then re fire & remeasure then to amp and speaks.

Russellc