Thanks guys, I want to use it with Salas Itch tube phono MM togheter my Denon DL103R tuned so I will need bal/in unbal/out as the schematic and pics. I need to change the 1K input resistor?
You can. Do you want to go higher or lower ?
Lower is not a problem at all.
Higher then 5kOhm is not advisable with this circuit though.
This is because the "natural" input impedance of this circuit is not very high.
If you need more then 5kOhm you can try BC327-40, BC337-40.
I would then reduce the current in each transistor to under 5mA.
Lower is not a problem at all.
Higher then 5kOhm is not advisable with this circuit though.
This is because the "natural" input impedance of this circuit is not very high.
If you need more then 5kOhm you can try BC327-40, BC337-40.
I would then reduce the current in each transistor to under 5mA.
Do you know if I have to buy a big quantity to match the transistors or with 20 or 30 pcs of each I will have enough?
They are cheep and because thy are made since many years they do not go astray much.
I even could send you some. When i knock on heavens door do you let me in because i am such a good guy ?
I even could send you some. When i knock on heavens door do you let me in because i am such a good guy ?
Thanks Joachim, I accept your offer, YHPM. I don't know if I can open the heavens door but for sure I can open my house door for you.
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It is a strange fact, but I am helping a good friend with a book which he has written which concerns Salmon Fishing here in my part of Scotland. (I am doing the photography).
Two weeks ago we visited a place - about 50 miles from here - which legend tells is the grave of Merlin the Magician. It IS a magical place, but so is all this part of Scotland! King Arthur is - again, legend - buried on a hill near here. Thre was also in the legend a prophecy that Scotland and England would not unite until two very small rivers joined together as one. On the same day as the Act of Union between Scotland and England was signed there was a thunderstorm; and, for a day the rivers became one!!
That is enough 'Off Topic' for now.
Two weeks ago we visited a place - about 50 miles from here - which legend tells is the grave of Merlin the Magician. It IS a magical place, but so is all this part of Scotland! King Arthur is - again, legend - buried on a hill near here. Thre was also in the legend a prophecy that Scotland and England would not unite until two very small rivers joined together as one. On the same day as the Act of Union between Scotland and England was signed there was a thunderstorm; and, for a day the rivers became one!!
That is enough 'Off Topic' for now.
Camping (illegal) on a hill slope, getting up in the morning, to look down on Loch Lomond covered in fog. (all memory gone of not getting in the caravan sites, due to lacking a membership card)
At risk of being OT here is a picture of the Eildon Hills, about 10 miles from my house. King Arthur - in a legend - is buried on one of these three! Other legend says he is buried in Somerset in SW England!!
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@Joachim, I have several questions:
-Where do you connect GND from PSU in the pcb or is floating?
-I see two big lytics in the middle of the pcb that aren't included in the schematic?
-Do you decoupled the input RCA gnd with 10nF?
-Where do you connect GND from PSU in the pcb or is floating?
-I see two big lytics in the middle of the pcb that aren't included in the schematic?
-Do you decoupled the input RCA gnd with 10nF?
You can use a floating supply and also a conventional plus-minus supply.
The middle of the plus-minus supply is then connected to audio ground.
I prefer floating when it works.
The lyrics and some foils on the underside decouple the PSU.
You can try a cap to ground at the input. 10nF is OK.
That can help to cancel radio ingress and tame the treble a bit.
The middle of the plus-minus supply is then connected to audio ground.
I prefer floating when it works.
The lyrics and some foils on the underside decouple the PSU.
You can try a cap to ground at the input. 10nF is OK.
That can help to cancel radio ingress and tame the treble a bit.
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