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Old 29th January 2013, 05:00 PM   #3601
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No worries, either will work. Just a diode.

@Antionel
Thats from the world of buildit
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Old 29th January 2013, 05:37 PM   #3602
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Thank!
Two more questions:
1) with 18V on secondary and CRC filtering with 0R125 can I use 4x 22kuf@35V before R and 4x 33kuf@25V after? Or it is safer to use 8x22kuf@35V?
2) Are these blue LEDs good for F6 TLHB4201 Vishay Semiconductors | Mouser ?
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Old 29th January 2013, 05:52 PM   #3603
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@buzzforb
Regarding your exercise in frivolity - are you saying lift the ground at the junction of R2 and R4 and connect to the mirrored side( same point)?

To me one of the incentives to do a BBA3 was that supplied with a SE signal the circuit would act as a unbalanced to balanced converter. Will the "balanced F6" act in the same way.

Hope I am not way off base

Thanks

Bob
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Old 29th January 2013, 06:13 PM   #3604
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You are correct.

Question of performance for m was around how the xformer would handle error current. Mr T kindly sent me two F6 boards loaded ervything but the outputs. I wil be using laterals to test the idea. Will make a little jumper to ty the two boards together.

Yes, you can drive it with SE.

It rally is more about a concept than anything. I also considered that the extra gain from the two sides would allow for low gain fets like laterals and Cree Sic devices, but i could be off base in my thinking.

I have some old school Vfets I need to get creative with. I mean i got to go copy something
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Last edited by buzzforb; 29th January 2013 at 06:18 PM.
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Old 29th January 2013, 06:22 PM   #3605
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Quote:
Originally Posted by PKI View Post
Thank!
Two more questions:
1) with 18V on secondary and CRC filtering with 0R125 can I use 4x 22kuf@35V before R and 4x 33kuf@25V after? Or it is safer to use 8x22kuf@35V?
2) Are these blue LEDs good for F6 TLHB4201 Vishay Semiconductors | Mouser ?
I dont see any advantage in mixing values. Cost is not good reason. 18V will give almost 24V rails, so i tihnk the 35V caps are better idea.

Red or green is preferred color for noise. If you dont have SS Jfets, then blue is what is need, i believe. You could always just use a zener. Just different type of votlage reference.
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Old 29th January 2013, 06:24 PM   #3606
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I do have SS's, so will that blue work?
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Old 29th January 2013, 06:26 PM   #3607
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Red. Ill send you some with your package.
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Old 29th January 2013, 07:43 PM   #3608
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Default Bridge DIY F6

Quote:
Originally Posted by buzzforb View Post
No worries, either will work. Just a diode.

@Antionel
Thats from the world of buildit


Does one need two diy F6 amplifiers to make a bridge amp? The attached diagram shows that one assembled diy F6 plus two loose R100A may only be required. Please consult the diagram, and note the following:
  • Q1, Q2 and the transformer are part of an assembled diy F6 as we know it.
  • Q1A and Q2A are the two additional R100A needed to make the bridge amp.
  • Point P1 [upper FET in F6] provides Q1A with bias, a signal which is out of phase with that on Q1's gate, and is within the feedback loop of diy F6.
  • Point P2 [lower FET in F6] has the same attributes of P1 above.
In operation, the pair Q1 and Q2A turn on, and the pair Q1A and Q2 turn off simultaneously. So current flows from +Vcc through Q1, via the load and through Q2A and back to -Vcc. The reverse [with signal phase reversal] happens as Q1 and Q2A turn off and the latter pair turns on. Now current flows from +Vcc through Q1A, via the load and through Q2 to -Vcc.

Best regards
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Old 29th January 2013, 07:46 PM   #3609
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There is another reason for connecting them this way. I like your idea, even if I am unsure it will work. Thats not to say it won't, just unsure. What happens to V gain.
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Old 29th January 2013, 07:54 PM   #3610
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Quote:
Originally Posted by buzzforb View Post
There is another reason for connecting them this way. I like your idea, even if I am unsure it will work. Thats not to say it won't, just unsure. What happens to V gain.
Thanks buzzforb. Good question about V gain. Maybe the circuit can be initially SIM'ed to unravel its potential.
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