The Nano is meant to be mounted in a socket. You pull it out of circuit for programming.
I didn't get the memo. I soldered in the nano. Too much trouble to unsolder now. I guess I'll just use a different transformer.
I have another transformer hooked up. It is 14-0vac. Seems to be working fine. The board powers up. Both LED's light. The board LED starts to blink after a while. When it powers up I read 12Vdc across the heater lugs but nothing across the inrush or power lugs. If I measure from the center pin of the RailSense terminal, I get 12Vdc at all three + terminalsl but the - sides seem to be open on the inrush and power. is the negative terminal the side that gets switched?
Thanks, Terry
Thanks, Terry
"To Serve and Protect" .... Police matra
With the output current overload protection in place, any plans for some type of "smart bias"?
Krell VFA amps use a Plateau Bias which senses large current demands at the output and at the pre-driver, and increases bias current for a short period before testing for safe bias reductions. Krell has recently patented iBias which uses a microprocessor to control the bias algorithm for Krells new CFA amps.
With the output current overload protection in place, any plans for some type of "smart bias"?
Krell VFA amps use a Plateau Bias which senses large current demands at the output and at the pre-driver, and increases bias current for a short period before testing for safe bias reductions. Krell has recently patented iBias which uses a microprocessor to control the bias algorithm for Krells new CFA amps.
Here are the two boards together.
What is the size of the main board?
Pcb group buy?
Thanks
What is the size of the main board?
Pcb group buy?
Thanks
The control board is 77 x 97mm. I haven't put any thought into a group buy. Gerbers are always available, and I usually have a couple left over test boards with minor errors to work around.
"To Serve and Protect" .... Police matra
With the output current overload protection in place, any plans for some type of "smart bias"?
Krell VFA amps use a Plateau Bias which senses large current demands at the output and at the pre-driver, and increases bias current for a short period before testing for safe bias reductions. Krell has recently patented iBias which uses a microprocessor to control the bias algorithm for Krells new CFA amps.
There was some talk early in the thread about "smart bias" but nothing has become of it yet.
It looks very nice, how big is the pcb?
How fast does it reacts in case of a short circuit?
It's so fast - the speaker cone doesn't even move ))
I have never really measured, but did a real life test - I have accidentally shorted the amp output to the negative rail, with the speakers connected
Scary? Just a small "click" from the speaker, the amp shut down.
Restart - no damage, it's just working again
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