Hey @baudouin0 I took your advice.
Open to any corrections from folks. The supply belies the thread title now…
Open to any corrections from folks. The supply belies the thread title now…
Running the heaters at 6Vdc is a lot less efficienct that running them at 12Vdc as you originally had it. Up to you I guess.
LR8 seems like overkill just for heater elevation.
LR8 seems like overkill just for heater elevation.
Thanks @Merlinb. It certainly is less efficient. Does it matter if the reference voltage is low impedance? Something doesn’t quite seem right about using a unbuffered filtered voltage divider in the same manner as elevated AC heaters. I could use a mosfet instead. I just wanna nail a repeatable voltage in the HT/4 range and have some output protection if it’s buffered.
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Nice one. I think I wanna avoid sinking 3mA out of the HT supply for that, so I’ll do a follower after a hi z range limited trim.
Also thank you for this:
As you can see, I referenced it. You still like that BJT in that position? Where else do you tend to use it? I should look at that ST part as well, I’m just getting into the modern enhancement options and I have three to spec (HT, bias, and phantom). The one I noted for HT is a placeholder.
Also thank you for this:
As you can see, I referenced it. You still like that BJT in that position? Where else do you tend to use it? I should look at that ST part as well, I’m just getting into the modern enhancement options and I have three to spec (HT, bias, and phantom). The one I noted for HT is a placeholder.
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Yes, although it doesn't need to be a high voltage part, a general purpose NPN will work.
Just noticed you have nearly 1000uF reservoir capacitance on your HT supply, that's crazy! Do you really need all that??