Hello @v4lve lover !
Can you give me the dimensions of the unit (HxWxL mm) ?
Could it be converted to 7.5VDC / 4A ? Or otherwise 7.5V 2.5A ?
My transformer can provide 12.8VAC / 7A
Thanks to let me know
T
Can you give me the dimensions of the unit (HxWxL mm) ?
Could it be converted to 7.5VDC / 4A ? Or otherwise 7.5V 2.5A ?
My transformer can provide 12.8VAC / 7A
Thanks to let me know
T
Hello to all self-builders!
I created a modified PCB, partial use of SMD components possible (also for MIC5156),
cutouts for better air circulation SK129 heat sink, use of normal circuit board connection terminals.
When ordered via JLCPCB, 10 boards including worldwide shipping cost approx. €4.50 or $5.00!
Have fun DIYing
I created a modified PCB, partial use of SMD components possible (also for MIC5156),
cutouts for better air circulation SK129 heat sink, use of normal circuit board connection terminals.
When ordered via JLCPCB, 10 boards including worldwide shipping cost approx. €4.50 or $5.00!
Have fun DIYing
yes, thanks for the tip, now that you say it it's actually clear!
I took it from the (unfortunately incorrect) Eagle circuit diagram.
I know that you can edit the Eagle LBR but I'm having a hard time with that too!
I found the bipolar type Panasonic SU-A at my parts dealer and it should fit!
I took it from the (unfortunately incorrect) Eagle circuit diagram.
I know that you can edit the Eagle LBR but I'm having a hard time with that too!
I found the bipolar type Panasonic SU-A at my parts dealer and it should fit!
Attachments
IC MIC5156 DIP8 or SMD SO8 available at Aliexpress
https://www.aliexpress.com/item/1005003083351535.html
https://www.aliexpress.com/item/1005004026584777.html
https://www.aliexpress.com/item/1005003083351535.html
https://www.aliexpress.com/item/1005004026584777.html
When using these for heaters of an indirecty heated tube. Do you guys ground one leg? Or can/should one use it floating?
I use these in my Aikido preamp build and reference the negative side to a voltage divider from B+ to raise the supply . Otherwise I would ground the negative side, yes.
I've grounded it. But I still have some hum. I think it is from being connected to 6,3vac taps on the same transformer as the HT supply. (Sort of the rattling of the rectifiers of the LDO supply) reflecting into the other windings.
It only draws 1A though (2*6v6) Salas pre.
It only draws 1A though (2*6v6) Salas pre.
This is a 6V6 preamp you're working on? I played with that for a while, and it is hard to get them quiet. Possibly heater-cathode leakage? Some 6V6's were quieter than others. You might try raising the supply with a voltage divider off the B+. Or even reference the negative to the cathodes of the 6V6s, so they're floating at, what 18 volts or so?
I'm using a separate toroid for the filaments in my scratch-built Aikido and it's dead quiet, but it took some fiddling. ;-)
I'm using a separate toroid for the filaments in my scratch-built Aikido and it's dead quiet, but it took some fiddling. ;-)
Thanks I will. That is really standard when I build amps. But since this used DC heaters I did not do it.You might try raising the supply with a voltage divider off the B+.
Yes. Really love it. But built 2 different power amps recently that brought to the fore this issue. So now I'm doing some tweaking on it.This is a 6V6 preamp you're working on?
Anyone have an issue with c1 and c2 exploding? I asked about the purpose of the caps. Since I'm building a few of Koifarm's boards that I ordered from jlcpcb.
Knowledgeable members mentioned that the polarity was reversed. Perhaps this was mentioned somewhere but I've never read it that I can remember.
Knowledgeable members mentioned that the polarity was reversed. Perhaps this was mentioned somewhere but I've never read it that I can remember.