For 23V rails and 1.3A bias, you should use 0.47R source resistors.
0.22R was for F5X with 16V rails and 2A bias.
The 15R resistor for the 2SJ74 should be split into 5R and 10R.
The 10R is inside the feedback loop.
The 5R outside the loop.
Patrick
F5 power amplifier
- Thread starter Nelson Pass
- Start date
0.22R was for F5X with 16V rails and 2A bias.
The 15R resistor for the 2SJ74 should be split into 5R and 10R.
The 10R is inside the feedback loop.
The 5R outside the loop.
Patrick
If it really bothers you, just use your SE interconnect cables that have lowest inductance/capacitance/resistance (if you have an LCR meter).
Converting a SE F5 to balanced may fix one issue, but create many more...
I usually don't worry about SE interconnects unless it is between phono and preamp.
Thanks for the perspective - I even find it quite tricky to find SE interconnects that long though...
OK, gonna get flamed, but I make interconnects out of CAT6 twisted pair ethernet wire (all ground and signal wires connected)...just make them just long enough for your application. CAT6 wire is designed for optimum signal transmission (within reason), and cheap.
I even use same CAT6 wires for Speaker Wires.
Hey Folks,
I have a pair of F5 version 3 boards, matched mosfets from RThatcher, will get some Jets from the DIY Store. My question is about the ZTX450 and ZTX550.
The 450 is easy to get but the 550 is scarce. I have looked at the data sheets of both and most of the specifications are close.
My question is, should I use the ztx451 and ztx551 as substitute's
Thanks
I have a pair of F5 version 3 boards, matched mosfets from RThatcher, will get some Jets from the DIY Store. My question is about the ZTX450 and ZTX550.
The 450 is easy to get but the 550 is scarce. I have looked at the data sheets of both and most of the specifications are close.
My question is, should I use the ztx451 and ztx551 as substitute's
Thanks
Dennis is 100% right.
That’s part of the limiter circuit, you can just ignore it if you want and leave them open. The F5m doesnt have the limiter. (Or the thermal compensation from the NTC thermistor…)
That’s part of the limiter circuit, you can just ignore it if you want and leave them open. The F5m doesnt have the limiter. (Or the thermal compensation from the NTC thermistor…)
Jim I do have an F5M essentials kit as well just need to start it
There is no reason. Just pop them in. But of course if you want experience of at least testing them, then by all means.
Also, I have built a F5 Type amp with and without the thermal regulation and it makes a little difference. Again, nothing significant to lose sleep over if you decide to skip that portion as well.
Having both the f5 and the and the f5m could be an interesting thing. I think what I would be curious to try is to reduce the feedback of the f5 to the 2x270R and compare it to the f5m. That would leave a few minor differences between the two. Then listen.
Thanks for the responses. I retired from American Airlines after 35 years. I was “Retired” for 15 months and DIY WAS AT FULL SPEED!!!!
Then one day my wife and daughter informed me I had failed Retirement.
I am now flying again so my projects are getting parsed out at a much slower rate!!
Task Management as we call it.
Again thanks,
Ty
Then one day my wife and daughter informed me I had failed Retirement.
I am now flying again so my projects are getting parsed out at a much slower rate!!
Task Management as we call it.
Again thanks,
Ty
At least you've got situational awareness now thanks to the fam. I bet you can accomplish some soldering in the flight deck. They have AC outlets, right? Just unplug the iPad for a little while.
Throw that bird into heading hold, fire up the soldering iron, have the FO hold the light and hand you parts. Gives new meaning to CRM!
Dan
Dan
