Sorry for being dumb but I'm guessing we need an LED that's around 22 volts right? Or am I missing something? Would love to use my Ice blue pastel LED but it's only around 3 volts.
LED's are current driven rather than voltage driven. 3 volts will be the forward voltage when its conducting, in other words the voltage you might measure across the LED. Nver run an LED from a voltage source directly.
So your blue LED will fine with that circuit although it may be much to bright with a 1k8 series resistor... if so fit something higher, maybe a lot higher such as 10k or 22k.
So your blue LED will fine with that circuit although it may be much to bright with a 1k8 series resistor... if so fit something higher, maybe a lot higher such as 10k or 22k.
Ahhh yes thank you that makes more sense to me now. Sorry my electronics principles are a little rusty, think I need to do some brushing up.
I have seen some excellent builds of this amp which is making me even more eager to build mine when the board finally arrives.
Can anyone who built theirs using the stock hammond enclose tell me if the volume pot is vertically centred through the front face plate then board mounted or will I have to mount it off the board to get the positioning right?
Can anyone who built theirs using the stock hammond enclose tell me if the volume pot is vertically centred through the front face plate then board mounted or will I have to mount it off the board to get the positioning right?
I board-mounted the BOM Alps pot and drilled the Hammond front plate after marking where the shaft made contact with the front plate. Not sure it's formally vertically centered, but it's where it needs to be and looks/works perfectly!
BK
Hi guys one last question, looks like the board I purchased may be lost in the post and not heard anything back from the store so I managed to find an early set of gerber files without the 2 resistors near the pot and wondered if anyone knew the pcb type, thickness, layers etc to use so I can get some made. Any help would be much appreciated. Thank you.
Thank you wayne for the quick response. Is it detrimental not having the 2 resistor positions or were they added later to reduce oscillation on the output or something?
Regards
Missing Inputresistor in Available Gerbers
I have been using this amp with boards I had ordered some time ago. I just soldered the resistors directly onto the input rca sockets with a short lead - place heatshrink over it and solder the cable to the other side of the resistor. Works like a charm. So no need to modify the Gerbers - at least in my eyes.
Cheers, Ernst
I have been using this amp with boards I had ordered some time ago. I just soldered the resistors directly onto the input rca sockets with a short lead - place heatshrink over it and solder the cable to the other side of the resistor. Works like a charm. So no need to modify the Gerbers - at least in my eyes.
Cheers, Ernst
What about my situation?
I use clone note LDR so I don’t include a pot after the input resistors(2.2kR);
Also I tried once direct coupling so there is no 1uF capacitors.
Now what’s left in the path is 2K2 and 1K resistors in series before the op amp.
It does not smoke or explode or anything. It sounds great.
Is this setup safe?
How about a single 3K2 resistor instead of 2 resistors in series?
I am just curious.
I use clone note LDR so I don’t include a pot after the input resistors(2.2kR);
Also I tried once direct coupling so there is no 1uF capacitors.
Now what’s left in the path is 2K2 and 1K resistors in series before the op amp.
It does not smoke or explode or anything. It sounds great.
Is this setup safe?
How about a single 3K2 resistor instead of 2 resistors in series?
I am just curious.