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Old 27th March 2007, 07:01 PM   #151
EUVL is offline EUVL  Europe
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If you need 9.78V (say 10V), you would want to have

R9+T1 = 22k/3

Read datasheet for TL431.


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Old 27th March 2007, 07:35 PM   #152
cviller is offline cviller  Denmark
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Quote:
Originally posted by EUVL
Read datasheet for TL431.



Reading is good. Did you know that you can make basically any circuit with those tl431s, currents source, voltage source, comparator, ohmmeter and phono amp - crazy little thing in my amp.

I'll try lowering it instead then...
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Old 27th March 2007, 08:19 PM   #153
EUVL is offline EUVL  Europe
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There are many many ways to generate the bias voltage.

TL431 is one. If you look at my schematics for Follower with gain a few post earlier, I just use resistors with current sources.


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Old 27th March 2007, 08:20 PM   #154
cviller is offline cviller  Denmark
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I put in some 5.49k's I had in the drawer and it worked perfectly. Now I can raise the current to almost 2A through each transistor but I have set the voltage across sources resistors to 300mA and then I'll listen some more and see how hot the sink gets.

I must say it sounds great. My preamp is too weak and shitty to show me the full potential of this buffer amp, but I'm one happy builder!!!

Thanks Patrick for helping me with the current and a huge thank you to Papa!!!
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Old 28th March 2007, 05:28 AM   #155
steenoe is offline steenoe  Denmark
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Congrats, cviller. Nice to see a finished and working F4 Really nice job on the boards. You are quite a wizzard. Mine is nearly finished and I am looking forward to try it with different preamps/speakers. Hopefully this weekend.

Steen
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Old 28th March 2007, 12:32 PM   #156
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Quote:
Congrats, cviller
...I am quite surprised! I had my money on your being first Steen! Are you feeling OK?


yeah. Congrats, cviller!
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Old 28th March 2007, 12:36 PM   #157
cviller is offline cviller  Denmark
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Quote:
Originally posted by mpmarino


...I am quite surprised! I had my money on your being first Steen! Are you feeling OK?
There is a really good explanation...

Although I have many weak links in my sound-system, I can tell you it sounds great!! Have you started populating your boards?
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Old 28th March 2007, 02:09 PM   #158
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Yes,
The boards are fully populated with the exception of the pots. There is little time available in the near future so I guess I'll get there someday.


I always insist on having a almost completed chassis before I turn an amp on. I'll let you know how it sounds around ... November maybe!
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Old 28th March 2007, 03:39 PM   #159
doggy is offline doggy  Canada
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Default A few questions

The f4 will be the next amp for me to build. I can follow schematics and get it done but I confess I am no electronics whizz but am interested to learn more.

A few questions please:
Setting bias, what is the voltage range? and should it be positive or can it be negative voltage measured at the outputs with the inputs shorted.

How do you measure amperage output of the amplifier?

Is there a good article on class A amplifier circuits?
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Old 28th March 2007, 04:17 PM   #160
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Unlike mpmarino, I have no high standards about firing up 15 pieces strung together by wire so I guess I'll be done before you (I hope)

My boards are populated and I started drilling the heatsinks, but ran into a problem with lack of any wiggle room, so I'm going to use bars of alu to hold the fets to the heatsink instead of screwing them down individually.

With any luck (and wife permitting), I should be making music by ... say mid-April
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