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Old 13th December 2004, 03:47 AM   #1
bvp9223 is offline bvp9223  United States
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Smile Elektor 1982 Simulation

Hi,
Elektor 1982 - I might call- circuit is not bad. Couple of minor modifications made here. Check this out.
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Old 15th December 2004, 08:06 AM   #2
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Thanx 4 the post....will love to try,,,but want of time...
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Old 15th December 2004, 10:39 AM   #3
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Does anybody have Elektor Summer circuits from 1979 / 1980?
I think there is a nice Class D amplifier in there..........
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Old 15th December 2004, 12:41 PM   #4
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How I can learn to do that?
What software you sue to simulate?
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Old 15th December 2004, 01:01 PM   #5
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LARS!!
I think i have that issue of Elector,
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Old 20th December 2004, 05:39 PM   #6
bvp9223 is offline bvp9223  United States
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I used Cadence OrCAD 15.0. However, OrCAD 9.2 will do. Good luck.
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Old 21st December 2004, 01:55 PM   #7
MikeB is offline MikeB  Germany
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Hi !

This circuit might produce smoke, you use a bc548c in the vas,
it has a max Vce of 30volt, you feed it with up to 80volts, and
Q6 will dissipate about 0.4Watts, quite much for a TO92 !
This gives ~105°C, hot enough to boil water !
You might consider a bd139 here... (With small heatsink maybe)
And i think c3 is way too big, 220pF here might cause oscillation.
A typical value here is 22pF.

Mike
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Old 21st December 2004, 04:20 PM   #8
jcx is offline jcx  United States
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you need to fix bias, 1/1.5 ma in diff pair at 0 V out is very wrong

R17 could be adjusted to balance the input Q currents

better would be to current mirror load the diff pair


also integrated darlingtons usually suck, discretes let you control driver bias better, but then you're getting to another amp altogether



Linear.com has the SwCad free spice simulator, no component/net limits, fast, solid - somewhat less sophisticated analysis tools but I haven't touched my OrCad Demo since trying LtSpice (even downloads faster and takes lots less room than OrCad)
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Old 21st December 2004, 05:28 PM   #9
jcx is offline jcx  United States
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...or the bias problem could be the other end, R18 could also be adjusted for diff pair bias symmety, but don't go too far and unbias the zener, the zener won't be a good regulator without several mA flowing through it


transient response is the only way to go for "debugging" - after you have the biasing correct

but it should be done at different scales with varying loads (esp. cable cap load)

really helpful for compensation is a small pulse riding on a slow lage amplitude sine to check operating point gain/comensation interaction
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Old 21st December 2004, 07:55 PM   #10
bvp9223 is offline bvp9223  United States
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jcx,
I totally agree with you. Appreciate your comments.
Thanks.
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