I see excessive crossover distortion with this audio amp not shown with LTspice. It simulates ok, but the wired circuit produces about a 50uS dead time step as the signal crosses the mid point. I tried increasing the bias with no help. Both inputs to the op-amp look good with no distortion. Any idea what is going on? Version 4 SHEET 1 880 1108 WIRE -128 80 -128 48 WIRE -128 80 -352 80 WIRE 80 80 -128 80 WIRE 208 80 80 80 WIRE -352 96 -352 80 WIRE 80 128 80 80 WIRE 208 176 208 160 WIRE -416 208 -432 208 WIRE -352 208 -352 176 WIRE -144 208 -352 208 WIRE -512 224 -512 208 WIRE 80 224 80 208 WIRE 144 224 80 224 WIRE 80 240 80 224 WIRE -352 256 -352 208 WIRE -144 304 -144 208 WIRE -112 304 -144 304 WIRE 80 320 -48 320 WIRE 208 320 208 272 WIRE 320 320 208 320 WIRE 336 320 320 320 WIRE 432 320 400 320 WIRE -112 336 -144 336 WIRE 80 336 80 320 WIRE -208 352 -208 336 WIRE 208 368 208 320 WIRE -80 384 -80 352 WIRE 144 416 80 416 WIRE -480 432 -480 416 WIRE 80 432 80 416 WIRE -208 448 -208 432 WIRE -144 448 -144 336 WIRE -144 448 -208 448 WIRE -96 448 -144 448 WIRE 16 448 -16 448 WIRE -208 464 -208 448 WIRE -480 528 -480 512 WIRE 80 544 80 512 WIRE -208 560 -208 544 WIRE 16 608 16 448 WIRE 320 608 320 320 WIRE 320 608 16 608 FLAG -80 288 +V FLAG -480 416 +V FLAG -480 528 0 FLAG -80 384 0 FLAG 432 400 0 FLAG -512 224 0 FLAG -352 336 0 FLAG 208 544 0 FLAG -208 336 +V FLAG 80 544 0 FLAG -208 560 0 FLAG -128 48 +V SYMBOL voltage -480 416 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 0 44 23 Left 0 WINDOW 3 51 56 Left 0 SYMATTR InstName V1 SYMATTR Value 8 SYMBOL pnp 144 272 M180 SYMATTR InstName Q1 SYMATTR Value 2N2905A SYMBOL npn 144 368 R0 SYMATTR InstName Q2 SYMATTR Value 2N2219A SYMBOL res 64 112 R0 SYMATTR InstName R1 SYMATTR Value 120 SYMBOL res 64 224 R0 SYMATTR InstName R2 SYMATTR Value 560 SYMBOL res 64 320 R0 SYMATTR InstName R3 SYMATTR Value 560 SYMBOL res 64 416 R0 SYMATTR InstName R4 SYMATTR Value 120 SYMBOL res 416 304 R0 SYMATTR InstName R5 SYMATTR Value 8 SYMBOL cap 400 304 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C2 SYMATTR Value 470=B5 SYMBOL voltage -416 208 R90 WINDOW 0 -32 56 VBottom 0 WINDOW 3 57 63 VTop 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value SINE(0 .25 1000) SYMBOL res 0 432 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R6 SYMATTR Value 10k SYMBOL res -368 240 R0 WINDOW 0 54 44 Left 0 WINDOW 3 52 76 Left 0 SYMATTR InstName R9 SYMATTR Value 20k SYMBOL cap -352 192 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C4 SYMATTR Value 1=B5 SYMBOL res -224 336 R0 WINDOW 0 -38 44 Left 0 WINDOW 3 -38 74 Left 0 SYMATTR InstName R7 SYMATTR Value 2k SYMBOL res -368 80 R0 WINDOW 0 50 43 Left 0 WINDOW 3 49 76 Left 0 SYMATTR InstName R10 SYMATTR Value 20k SYMBOL res 192 448 R0 SYMATTR InstName R11 SYMATTR Value .2 SYMBOL res -224 448 R0 WINDOW 0 -37 42 Left 0 WINDOW 3 -35 76 Left 0 SYMATTR InstName R8 SYMATTR Value 2k SYMBOL Opamps\\UniversalOpamp2 -80 320 R0 SYMATTR InstName U2 SYMBOL res 192 64 R0 SYMATTR InstName R12 SYMATTR Value .2 TEXT -504 600 Left 0 !.tran 0 100m 0 startup
Audio Amp Crossover Distortion?
Started by ●January 12, 2012
Reply by ●January 12, 20122012-01-12
"Bill Bowden" I see excessive crossover distortion with this audio amp not shown with LTspice. It simulates ok, but the wired circuit produces about a 50uS dead time step as the signal crosses the mid point. I tried increasing the bias with no help. Both inputs to the op-amp look good with no distortion. Any idea what is going on? ** You need to post a schematic - dickhead. Totally SMARTARSE of you to post only a Spice list on SEB. ... Phil
Reply by ●January 12, 20122012-01-12
On 2012-01-12, Phil Allison <phil_a@tpg.com.au> wrote:> > "Bill Bowden" > > I see excessive crossover distortion with this audio amp not shown > with LTspice. It simulates ok, but the wired circuit produces about a > 50uS dead time step as the signal crosses the mid point. I tried > increasing the bias with no help. Both inputs to the op-amp look good > with no distortion. Any idea what is going on? > > > ** You need to post a schematic - dickhead. > > Totally SMARTARSE of you to post only a Spice list on SEB.open it with ltspice and you can see the schematic It's not just a netlist. -- ⚂⚃ 100% natural --- Posted via news://freenews.netfront.net/ - Complaints to news@netfront.net ---
Reply by ●January 12, 20122012-01-12
Phil Allison wrote:> > "Bill Bowden" > > I see excessive crossover distortion with this audio amp not shown > with LTspice. It simulates ok, but the wired circuit produces about a > 50uS dead time step as the signal crosses the mid point. I tried > increasing the bias with no help. Both inputs to the op-amp look good > with no distortion. Any idea what is going on? > > ** You need to post a schematic - dickhead. > > Totally SMARTARSE of you to post only a Spice list on SEB.Grow up, jackass. Download and install LTspice IV: http://www.linear.com/designtools/software/ -- You can't have a sense of humor, if you have no sense.
Reply by ●January 12, 20122012-01-12
"Jasen Betts = TROLLING PSYCHO PARROT "> >> >> ** You need to post a schematic - dickhead. >> >> Totally SMARTARSE of you to post only a Spice list on SEB. > > open it with ltspice and you can see the schematic** Fuck off to hell !!! You MORONIC pile of Kiwi sheep shagging shit.
Reply by ●January 12, 20122012-01-12
Reply by ●January 12, 20122012-01-12
"Bill Bowden = fuckwit TROLL" I see excessive crossover distortion with this audio amp not shown with LTspice. It simulates ok, but the wired circuit produces about a 50uS dead time step as the signal crosses the mid point. I tried increasing the bias with no help. Both inputs to the op-amp look good with no distortion. Any idea what is going on? ** Yeah - you fucked up as bloody usual. ... Phil
Reply by ●January 12, 20122012-01-12
On Thu, 12 Jan 2012 23:28:59 +1100 "Phil Allison" <phil_a@tpg.com.au> wrote in Message id: <9n820mFoqfU1@mid.individual.net>:> >"Jasen Betts = TROLLING PSYCHO PARROT " >> >>> >>> ** You need to post a schematic - dickhead. >>> >>> Totally SMARTARSE of you to post only a Spice list on SEB. >> >> open it with ltspice and you can see the schematic > > >** Fuck off to hell !!! > > You MORONIC pile of Kiwi sheep shagging shit.What's the matter Phil? The ol' inner child striking out because your old man butt fucked you as a kid?
Reply by ●January 12, 20122012-01-12
On Thu, 12 Jan 2012 15:55:05 +1100, Phil Allison wrote:> ** You need to post a schematic - dickhead. > > Totally SMARTARSE of you to post only a Spice list on SEB.What he posted *is* a schematic. -- "For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." (Richard Feynman)
Reply by ●January 12, 20122012-01-12
On Jan 11, 11:55=A0pm, "Phil Allison" <phi...@tpg.com.au> wrote:> "Bill Bowden" > > I see excessive crossover distortion with this audio amp not shown > with LTspice. It simulates ok, but the wired circuit produces about a > 50uS dead time step as the signal crosses the mid point. I tried > increasing the bias with no help. Both inputs to the op-amp look good > with no distortion. Any idea what is going on? > > ** You need to post a schematic =A0- =A0dickhead. > > Totally =A0SMARTARSE of you to post only a Spice list on SEB. > > ... =A0PhilI was going to say it's a push-pull.... but it's flipped about. Here's a pic http://imageshack.us/photo/my-images/708/crossover.jpg/ Does this output have a name? George H.
