Congrats😎 I knew your review would sound like that😀
Great job; drawing boards saturday, playing music sunday. Ya' fast as LL
🙂
Great job; drawing boards saturday, playing music sunday. Ya' fast as LL
🙂
Does anyone know if there are currently any group buys for PCBs or parts for the F5 project ?
Thanks
Thanks
Parts can be found here: http://www.tech-diy.com/Store/CloneKits.htm
I am not aware of a PCB group buy.
I am not aware of a PCB group buy.
The raw parts are fairly easy to find in the USA. He supplies 10K for for R21-22. I thought I read somewhere that those were changed to 22K ?
I was sort of hoping for the PC board for the output stage and heat sinks/ case so it doesn't look like an early beta version when it's through.
I was sort of hoping for the PC board for the output stage and heat sinks/ case so it doesn't look like an early beta version when it's through.
cviller said:
we can make single sided pcb ourselves..a double sided board will be better for group buy if Nelson permits....and we need fairchild output transistors..i am agree for group buy
I am in for a fairchild based board. Double, single, triple I really do not care. I have found I have more success in putting components on a board then hooking them together.
I would also be interested in a board.
I recall there was mention that at some point in time PASS DIY would be offering F5 boards for sale. Perhaps that has fallen by the wayside?
I recall there was mention that at some point in time PASS DIY would be offering F5 boards for sale. Perhaps that has fallen by the wayside?
I just shot you an email. But nevermind it. Here is a link to all you need to build it.
http://www.firstwatt.com/downloads/F5-om_sm-080527.pdf
Uriah
http://www.firstwatt.com/downloads/F5-om_sm-080527.pdf
Uriah
firing up but fuse blowing
please help a newbie... I have made one up with p to p using the Juma's lay out. I have reduced the P1 and P2 value to minimum ( they are 1-5 ohm now) as stated in the Nelson's article and used variac to slowly move up the AC. The fuse blows up before rail voltage reaches 2V.. If I disconnect +- 24 and ground from main board, rail voltage reaches 26V no problem... It appears to me that if P1 and P1 is minimum value all the voltage is applied across JFET. Is this O.K.? What am i doing wrong? I'm using psu board from peter daniel and it seems psu is o.k...
Thanks!
please help a newbie... I have made one up with p to p using the Juma's lay out. I have reduced the P1 and P2 value to minimum ( they are 1-5 ohm now) as stated in the Nelson's article and used variac to slowly move up the AC. The fuse blows up before rail voltage reaches 2V.. If I disconnect +- 24 and ground from main board, rail voltage reaches 26V no problem... It appears to me that if P1 and P1 is minimum value all the voltage is applied across JFET. Is this O.K.? What am i doing wrong? I'm using psu board from peter daniel and it seems psu is o.k...
Thanks!
The raw parts are fairly easy to find in the USA. He supplies 10K for for R21-22. I thought I read somewhere that those were changed to 22K ?
You did its back at post 1948, so you would have to replace the 10K provided.
You did its back at post 1948, so you would have to replace the 10K provided.
Re: firing up but fuse blowing
Haha. Are you guys serious? The number of layers is quite irrelevant - you can make the most absolute horrible layout using double layer if you want to. I have used a single layer because no more is needed for this application (when I do phono stages and digital circuits I usually make a ground plane as well). If I had to get the boards manufactured, I might throw in another layer to reduce board size, but then the old farts in here might have troubles stuffing the boards. 😉
Sounds like you have a short or have connected your power fets wrongly (if connected wrong, they are just power diodes). Try monitoring the voltage across the source power resistors (r11 and r12) when you turn up the voltage slowly. Otherwise post some detailed pictures and people in here might be able to help you.
umut1001 said:
Haha. Are you guys serious? The number of layers is quite irrelevant - you can make the most absolute horrible layout using double layer if you want to. I have used a single layer because no more is needed for this application (when I do phono stages and digital circuits I usually make a ground plane as well). If I had to get the boards manufactured, I might throw in another layer to reduce board size, but then the old farts in here might have troubles stuffing the boards. 😉rdk845 said:
Sounds like you have a short or have connected your power fets wrongly (if connected wrong, they are just power diodes). Try monitoring the voltage across the source power resistors (r11 and r12) when you turn up the voltage slowly. Otherwise post some detailed pictures and people in here might be able to help you.
Re: Re: firing up but fuse blowing
LOL
😀
cviller said:
LOL
😀
