Bournes 4608X-101-472LF is what I used. Any 4.7k bussed 7 or 8 pin should work. Pin 8 is unused.
If the holes are spaced properly, your terminal blocks are wrong. Possibly .156" centers? You can double check the spacing of the terminal blocks the same way. If you measure a gang of them the error is easier to see.
Spacing on pcb from thimios is 70mm☺
I must remember connector to j1.
Is it okay to use socket for IC1, maybe mouser have that too☺
I must remember connector to j1.
Is it okay to use socket for IC1, maybe mouser have that too☺
Has anyone modified this circuit to monitor voltage in a tube amp using divider network?
I want to turn on filaments, after 90 seconds fire relay 2 for 5 seconds of HV soft start, then fire relay 3 bypassing soft start circuit.
Continue to monitor cathode voltages for any issues. If any faults, turn off HV relays.
Would this be too difficult for the hobbyist? I'm a quick learner and pretty darn handy with building a circuit board, simulation, cad, etc...
Another words, is Aurdino programming a bit@$
I want to turn on filaments, after 90 seconds fire relay 2 for 5 seconds of HV soft start, then fire relay 3 bypassing soft start circuit.
Continue to monitor cathode voltages for any issues. If any faults, turn off HV relays.
Would this be too difficult for the hobbyist? I'm a quick learner and pretty darn handy with building a circuit board, simulation, cad, etc...
Another words, is Aurdino programming a bit@$
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Do you want to do this as a separate extra input or in place of one? It shouldn't be hard to do, but it should likely be done separate from the protection board and optically isolated depending on the cathode voltage. What voltage are you running?
Cathode voltages are about 100v but with a divider network I can get it down under 5v.
My original idea was to try a PIC and get the divider network down to 3v so I have some resolution each way (for 0-5v, 256 bits). Instead of using tight tolerance resistors, I would have a pot to calibrate (to 3 volts @ cathodes idle current/voltage).
My original idea was to try a PIC and get the divider network down to 3v so I have some resolution each way (for 0-5v, 256 bits). Instead of using tight tolerance resistors, I would have a pot to calibrate (to 3 volts @ cathodes idle current/voltage).
100V can connect easily into these boards. The bias inputs are connected directly to speaker output voltage through a divider into optoisolators. This could easily be modified to a voltage detector circuit.
If you want to actually monitor the voltage an I2C adc would work too. The boards I'm testing right now have an I2C bus on them for expansion.
http://ca.mouser.com/ProductDetail/...=sGAEpiMZZMtgJDuTUz7Xux12P9e9sDTcKPVjQ0NLOBo=
http://ca.mouser.com/ProductDetail/...=sGAEpiMZZMtgJDuTUz7Xux12P9e9sDTcKPVjQ0NLOBo=
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I've just got a few tester boards right now. I will have a few spares and Gerbers are always available.
Hi,
I'm pretty much done with stuffing my 5-pair OPS (older PCB version) and Spooky IPS boards, but I'm afraid to fire them up without any protection. So it's time to build the protection board first. Could you please direct me to the current schematic and Gerber files to build the most recent version? What else do I need? The software from Valery?
The thread is getting rather long and easy to get confused for less experienced builders like me.
Thanks
Hi, please drop your email to my PM - I will send you the firmware for the board. The latest "finished" version of the board is 3.5, schematic is attached.
Gerbers - either I will send them later today or tomorrow, or Jeff will send them to you.
Cheers,
Valery
Hi, please drop your email to my PM - I will send you the firmware for the board. The latest "finished" version of the board is 3.5, schematic is attached.
Gerbers - either I will send them later today or tomorrow, or Jeff will send them to you.
Cheers,
Valery
