Hi
Here the LTSice translation of circuit in post #55
It does not work at all. Until now I can not found where the error is.
Maybe some experienced eagle eye can point if I miss/screw something?
I suspect the CCS's. (or maybe some stupid miswiring, dot or comma out of place?)
Beautiful work in post #59 #60. A competent 2D layout is absolutely beyond me.
I work only 3D 'rat nest' 🙂
Here the LTSice translation of circuit in post #55
It does not work at all. Until now I can not found where the error is.
Maybe some experienced eagle eye can point if I miss/screw something?
I suspect the CCS's. (or maybe some stupid miswiring, dot or comma out of place?)
Beautiful work in post #59 #60. A competent 2D layout is absolutely beyond me.
I work only 3D 'rat nest' 🙂
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C9(100nF) is to large , 100pF will be just OK ,
C17(100nF) is to small , 100uF will be OK ,
C5 & C6 need larger values , 1000uF or some larger values is OK .
why two Zobel network ? , one Z- network consisting of 100nF+10 ohm is just enough .
Edit , upper and lower CCS circuits have different connection !
Regards !
C17(100nF) is to small , 100uF will be OK ,
C5 & C6 need larger values , 1000uF or some larger values is OK .
why two Zobel network ? , one Z- network consisting of 100nF+10 ohm is just enough .
Edit , upper and lower CCS circuits have different connection !
Regards !
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Banat, component figures are exactly as Borys design. CCS wrongly connected is my fault. Thanks to point at the err.
Cheers
J.
Cheers
J.
Wrong connection between emmiter of Q1 and collector of Q5 deleted.
The circuit still does not work
now we are talking!
bad connection between Q1/Q5, corrected
misplaced C7/C8, corrected
VR1 adjusted (offset 1mv)
still to do: VR2 bias adjust not enough to solve issue of THD being bigger at 1W than at 60W .
I left this to others. I'm not going to build a CCS loaded version.
Cheers
J.
bad connection between Q1/Q5, corrected
misplaced C7/C8, corrected
VR1 adjusted (offset 1mv)
still to do: VR2 bias adjust not enough to solve issue of THD being bigger at 1W than at 60W .
I left this to others. I'm not going to build a CCS loaded version.
Cheers
J.
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Obviously OPS -IQ is way to low ,~1,6mA only , causing high Xover distortion , you have to play with R13 & R14 values ratio to get much higher optimum IQ .
I agree with that.
Interestingly these circuit with the 4 extra diode plus Toshiba 2sk1530 & 2SJ201 performed excellent
On that time Borys wrote the best amplifier he ever built.
I think I do have the layout for these to but with 2 pair darlington or mosfet.
I do have some Toshiba mosfet but I need those for some other project, with darlington it would be nice if these would work or perform nice.
Also I have a kit from Aussie Amplifier the one with the 4 pair Toshiba mosfet ready to build it so no more mosfet to me..
Greetings
Hi Gabor !
One more thing about this amp ,
I think that only 0,22R is to low Re value for TI147/142 power Darlingtons , maybe 0,47R or even some slightly higher value can be better solution regarding nominal 8 or even 4 ohm load(speaker) , Re=0,22R is I think good for 16 ohm load(speaker) , I see no further reason for these litle CFA Darlington based amp to not perform and sound very very good .
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And yes ,as always it is my special pleasure to communicate with you !
One more thing about this amp ,
I think that only 0,22R is to low Re value for TI147/142 power Darlingtons , maybe 0,47R or even some slightly higher value can be better solution regarding nominal 8 or even 4 ohm load(speaker) , Re=0,22R is I think good for 16 ohm load(speaker) , I see no further reason for these litle CFA Darlington based amp to not perform and sound very very good .
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And yes ,as always it is my special pleasure to communicate with you !
in doing spice simulations you can easily be fooled by missing or overlooking some little big detail, when in the test bench, instead, you can't miss or ignore the smoke signals 😀
Good to know that
You right the 0R22 a bit low even to the 8 Ohm speakers 0R33 give more protection.
The truth is that resistor has some effect on the sound to or I would rather say dynamic and bass region
At other hand very likely with the higher value the amp more stable.
Also depend how hard we push the amp
Yes you right about that resistors 🙂 In my circuit originally with the BDW83C & BDW84C had 0R33.
A bit more rugged than the TIP.
Hard to find from ST Semi, I tested the BDW from other company but waste of money... I ordered those from Europe Rechel something ISC marked ..
I do have some Sanken Darington , not exactly the same, I will try those to.
Greetings
How I wrote earlier I do have the layout for these circuit but with two pair darlingtons.
Right now the pars are not marked, I will do that when the final circuit will be posted and someone willing to build it or test it.
Greetings
Right now the pars are not marked, I will do that when the final circuit will be posted and someone willing to build it or test it.
Greetings
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Dear Gaborbela,
why these were waste of money? Did they explode (ISC marked BDW's) even not reaching full power?
I bought couple of ISC marked BDW'S. Not tested at full load. And now I am afraid to test it. Power supply voltage is +-48VDC, but I will use 0.47Ohm emitter resistors. It will be Class B amp.
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Yes it is marked ISC and BDW'S 83C & 84C or 83D & 84D I got both type
My friend purchase in Germany from a big name electronics supplier (they sent to my friend a big catalog thick like a phone book he did not open the package and sent it to Canada , what a waste of money)
Anyway to me the ISC one by one blew up sometimes at the first power up sometimes one or two hour later.
The much smaller BDW93C & 94C from ST semiconductor run with out any issue month after month...
Even today when I see the mark of the ISC on a semiconductor I would not buy that ..
Please test it and also test the BDW93C & 94C you will se the difference..
My rail voltage was just under 40V and the emitter resistor 0.33R the bias under 50mA..
Again the ST Moroco 93C & 94C outperformed the ISC 2X bigger chip both way sound wise and technically to ..
I think I still have some ISC but to me only useful to put under the leg of the table..
You can but BDW83C & 84C on Ebay from a Canadian supplier 100% original ST Moroco I ordered from him 10 pairs
Darlington Power Transistors NPN 100V 15A BDW83C | eBay
Greetings
My friend purchase in Germany from a big name electronics supplier (they sent to my friend a big catalog thick like a phone book he did not open the package and sent it to Canada , what a waste of money)
Anyway to me the ISC one by one blew up sometimes at the first power up sometimes one or two hour later.
The much smaller BDW93C & 94C from ST semiconductor run with out any issue month after month...
Even today when I see the mark of the ISC on a semiconductor I would not buy that ..
Please test it and also test the BDW93C & 94C you will se the difference..
My rail voltage was just under 40V and the emitter resistor 0.33R the bias under 50mA..
Again the ST Moroco 93C & 94C outperformed the ISC 2X bigger chip both way sound wise and technically to ..
I think I still have some ISC but to me only useful to put under the leg of the table..
You can but BDW83C & 84C on Ebay from a Canadian supplier 100% original ST Moroco I ordered from him 10 pairs
Darlington Power Transistors NPN 100V 15A BDW83C | eBay
Greetings
Member
Joined 2009
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Gabor - the CCS at front end will stabilize your amp (I used this approach in my TGM7). Is this what you seek at the end, or do you wish to make your original design work without such changes - I'm curious what is your dream ?
Hi
The post 76 layout can be used with darlington or Toshiba power device and has CCS..
My only problem got some health issue tomorrow have appointment with my family doctor let see her advise. Having a lot of difficulties to move my left arm (because my shoulder) I thought if I forced and do some work out will help but made it worst.
Now only can sleep with strong pain killers ..
Greetings gabor
The post 76 layout can be used with darlington or Toshiba power device and has CCS..
My only problem got some health issue tomorrow have appointment with my family doctor let see her advise. Having a lot of difficulties to move my left arm (because my shoulder) I thought if I forced and do some work out will help but made it worst.
Now only can sleep with strong pain killers ..
Greetings gabor
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