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Q&A Tesatronic TTD20 DGND AGND unconnected

I see and from the photo left to right , the 3 regulators are ; +15, -15 , + 5.0 LM324-15 LM320-15 LM324-50 The +ve LDO's share the same heatsink with insulator + plastic screws. To...

posted 1mo ago by TonyStewart‭ · edited 1mo ago by TonyStewart‭

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#3: Post edited by

TonyStewart‭ · 2025-02-19T00:24:19Z (about 1 month ago)

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I see ![Image_alt_text](https://electrical.codidact.com/uploads/6qshkcfva5wl7wirq41kf4sl5drl)
and from the photo left to right , the 3 regulators are ;
+15, -15 , + 5.0
LM324-15 LM320-15 LM324-50
The +ve LDO's share the same heatsink with insulator + plastic screws.
To sharing Dgnd noise with analog ground , you can use Dgnd from the 5V out using this photo.
![Image_alt_text](https://electrical.codidact.com/uploads/obh1hoo4wkiix7wshvicak59vpqo)

I see ![Image_alt_text](https://electrical.codidact.com/uploads/6qshkcfva5wl7wirq41kf4sl5drl)
and from the photo left to right , the 3 regulators are ;
+15, -15 , + 5.0
LM324-15 LM320-15 LM324-50
The +ve LDO's share the same heatsink with insulator + plastic screws.
To sharing Dgnd noise with analog ground , you can use Dgnd from the 5V out using this photo.
![Image_alt_text](https://electrical.codidact.com/uploads/obh1hoo4wkiix7wshvicak59vpqo)
There should be only 2 secondary gnds on transformer!
If it is not wired like schematic, fix it.
![Image_alt_text](https://electrical.codidact.com/uploads/ayzuot9uisuem72108r2rcm2bm5v)

#2: Post edited by

TonyStewart‭ · 2025-02-19T00:16:41Z (about 1 month ago)

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I see ![Image_alt_text](https://electrical.codidact.com/uploads/6qshkcfva5wl7wirq41kf4sl5drl)
and from the photo left to right , the 3 regulators are ;
+15, -15 , + 5.0
LM324-15 LM320-15 LM324-50
The +ve LDO's share the same heatsink with insulator + plastic screws.
~~To avoid analog ground noise, you can use Dgnd from the 5V out using~~
![Image_alt_text](https://electrical.codidact.com/uploads/obh1hoo4wkiix7wshvicak59vpqo)

I see ![Image_alt_text](https://electrical.codidact.com/uploads/6qshkcfva5wl7wirq41kf4sl5drl)
and from the photo left to right , the 3 regulators are ;
+15, -15 , + 5.0
LM324-15 LM320-15 LM324-50
The +ve LDO's share the same heatsink with insulator + plastic screws.
To sharing Dgnd noise with analog ground , you can use Dgnd from the 5V out using this photo.
![Image_alt_text](https://electrical.codidact.com/uploads/obh1hoo4wkiix7wshvicak59vpqo)

#1: Initial revision by

TonyStewart‭ · 2025-02-19T00:15:29Z (about 1 month ago)

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I see ![Image_alt_text](https://electrical.codidact.com/uploads/6qshkcfva5wl7wirq41kf4sl5drl)
and from the photo left to right , the 3 regulators are ;
+15,     -15 ,      + 5.0
LM324-15 LM320-15  LM324-50

The +ve LDO's share the same heatsink with insulator + plastic screws.

To avoid analog ground noise, you can use Dgnd from the 5V out using

![Image_alt_text](https://electrical.codidact.com/uploads/obh1hoo4wkiix7wshvicak59vpqo)

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