GB: A Simple Discrete Current-Mirror IV Converter, à la AD844

[Ripster]

Well we hit the minimum we can wait a few days more. Let's say till the end of weak.

 

[jimk04]

Is it 2sk2145BL we need?

 

[EUVL]

There is NO JFET inn the circuit.
All bipolar transistors.
Please read and digest the PDF document linked in post #1.


Patrick

 

[jimk04]

Thanks. I have been reading that and it is where I got reference to the 2145. No worries. Shall look again and probably just wait for the BOM and boards to make sure

 

[EUVL]

2SK2145 is required if you use a DAC with an offset current, like PCM1798.
In any case this circuit is meant für low current signal, max +/-2mA, e.g. AD1862, PCM1704, .....
For higher current, you need to parallel units.


Patrick

 

[ernesternest]

a set for me as well please 🙂

Ripster 1
Paddy Garcia 1
jimk04 1 UK
markus22ch 1
Vunce 1 USA
John Luckins 1 UK
ixix 1
pfarrell 1 USA
Quantensprung 2
ernesternest 1

 

[kartk]

Ripster 1
Paddy Garcia 1
jimk04 1 UK
markus22ch 1
Vunce 1 USA
John Luckins 1 UK
ixix 1
pfarrell 1 USA
Quantensprung 2
ernesternest 1
Kartk 1 India

 

[rss388]

Ripster 1
Paddy Garcia 1
jimk04 1 UK
markus22ch 1
Vunce 1 USA
John Luckins 1 UK
ixix 1
pfarrell 1 USA
Quantensprung 2
ernesternest 1
Kartk 1 India
rss388 1 USA

 

[Ripster]

So now that we have reached minimum quantity, I checked for post options and cheapest letter with tracking and insurance is 10€ for EU and 14€ for US and rest of the world. If anyone is feeling adventurous shipping without tracking and insurance is about 50% cheaper.

 

[Vunce]

Hi Ripster,
Thanks for putting together this GB!
I would prefer the insured with tracking option 😉

 

[androa76]

Ripster 1
Paddy Garcia 1
jimk04 1 UK
markus22ch 1
Vunce 1 USA
John Luckins 1 UK
ixix 1
pfarrell 1 USA
Quantensprung 2
ernesternest 1
Kartk 1 India
rss388 1 USA
androa76 1

 

[Ripster]

Hi Vounce no problem I would want to have insurance to! 😀

 

[Malvin]

Ripster 1
Paddy Garcia 1
jimk04 1 UK
markus22ch 1
Vunce 1 USA
John Luckins 1 UK
ixix 1
pfarrell 1 USA
Quantensprung 2
ernesternest 1
Kartk 1 India
rss388 1 USA
androa76 1
Malvin 1 USA

 

[psmith001]

Ripster 1
Paddy Garcia 1
jimk04 1 UK
markus22ch 1
Vunce 1 USA
John Luckins 1 UK
ixix 1
pfarrell 1 USA
Quantensprung 2
ernesternest 1
Kartk 1 India
rss388 1 USA
androa76 1
Malvin 1 USA
psmith048 1 USA

 

[weissi]

Ripster 1
Paddy Garcia 1
jimk04 1 UK
markus22ch 1
Vunce 1 USA
John Luckins 1 UK
ixix 1
pfarrell 1 USA
Quantensprung 2
ernesternest 1
Kartk 1 India
rss388 1 USA
androa76 1
Malvin 1 USA
psmith048 1 USA
weissi 2 Austria

 

[EUVL]

Please help to add a running total as you subscribe :

Ripster 1
Paddy Garcia 1
jimk04 1 UK
markus22ch 1
Vunce 1 USA
John Luckins 1 UK
ixix 1
pfarrell 1 USA
Quantensprung 2
ernesternest 1
Kartk 1 India
rss388 1 USA
androa76 1
Malvin 1 USA
psmith048 1 USA
weissi 2 Austria
___________________
Running total 18



Patrick

 

[Kuka]

Ripster 1
Paddy Garcia 1
jimk04 1 UK
markus22ch 1
Vunce 1 USA
John Luckins 1 UK
ixix 1
pfarrell 1 USA
Quantensprung 2
ernesternest 1
Kartk 1 India
rss388 1 USA
androa76 1
Malvin 1 USA
psmith048 1 USA
weissi 2 Austria
Kuka 1 EU
___________________
Running total 19

 

[nautibuoy]

Ripster 1
Paddy Garcia 1
jimk04 1 UK
markus22ch 1
Vunce 1 USA
John Luckins 1 UK
ixix 1
pfarrell 1 USA
Quantensprung 2
ernesternest 1
Kartk 1 India
rss388 1 USA
androa76 1
Malvin 1 USA
psmith048 1 USA
weissi 2 Austria
Kuka 1 EU
nautibuoy 1 UK
___________________
Running total 20

 

[Paddy Garcia]

There is NO JFET inn the circuit.
All bipolar transistors.
Please read and digest the PDF document linked in post #1.

Toshiba HN1B04F and HN1B01F look like they might fit the bill...

 

[Ripster]

So I was thinking of maybe doing transistor matching for this GB also. I created a spreadsheet to see how many are interested.
There is no price point yet, minimum would be 6 pairs matched 2 channels single ended and 3 pairs not matched for testing. For second pair of PCBs it would be additional 6 pairs matched transistors.
I need to get a hold of sot23 testing socket which I could only find from china. So this will take quite some time. If anyone is willing to wait please sign in spreadsheet.



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