Schottky diode with low forward voltage

F

Felice

New member
Hello
Yesterday I ordered the last Limited Edition BeePre 300B  Preamplifier Kit.

Our mains voltage in the Basel / Switzerland is 232-236 volts wavering.

My question, could you replace the Schottky 80SQ045N or 1N5820 with other types that have even lower forward voltage?
After all, it's about every millivolt profit that the LM 1085 works clean.

Best regards
Felix
 
235V is going to work quite nicely, it's the 220V countries where things get a little low.

You might also consider picking up a 230:6 transformer and wiring it as a boost transformer, which will nudge up your line voltage a bit more and give you some extra headroom.

While there are lower voltage drop Schottky diodes, they are mostly in TO-220 packages that aren't going to work super well with the BeePre layout. 
 
Hello
Thanks for your answer. I still have an auto-transformer. However, 1000VA with Prim 230 volts to 246 volts. According to the data sheet. Let's see if that's not too much of a good thing. Will it then measure.

  Another question,
I already read, or in other words, it is recommended that in a pentode, when switched to triode, between anode and sreen grid ( g2) resistor, a UF 4007 is switched.
Apart from the layout, so in this case between R 215 and C9 / D9.
I do not know how far this changes the circuit. And if something really brings an advantage.
Has this been done before?


Best regards
Felix
 
So the Bee Pre is finished today. Switched on and playing for 4 hours now. The sound is excellent.  :) Unfortunately, there is a problem. At about 6:00 pm the mains voltage fluctuated, so there was something unpleasant hum. Short measured. 230V. Accordingly, the sec voltage was 5.6 volts AC.

Now I'm thinking about buying the PVEA2000 230 / 200-215V auto-transformer 230VAC 200VAC, Tufvassons transformer.

https://www.distrelec.ch/Web/Downlo...rmers do not go up in smoke right away. Felix
 
Hello
In the scheme, a 215 Ohm grid stopper is located.
Have I overlooked the instructions or does not it matter if he is missing?

Otherwise, the upgrade BEE QUIET is a quite outstanding fine thing :)
 
You must log in or register to reply here.
Back
Top