The Ping-Pong VAS

Stee · 2nd September 2008, 08:08 PM

see what happens with the copy and paste

kubeek · 2nd September 2008, 10:36 PM

I don´t see it.

Stee · 2nd September 2008, 10:44 PM

darkfenriz · 2nd September 2008, 10:50 PM

The schematic is wrong.
Output stayes at around 1.4 V.
Also such a "spring" between collectors usually results is stauration of one of transistors.

Adam

megajocke · 3rd September 2008, 12:25 PM

The "STD VAS" won't work correctly either. The upper part half of the circuit can't swing negative and vice versa.

darkfenriz · 3rd September 2008, 02:42 PM

true

Stee · 3rd September 2008, 03:21 PM

see this that i have copied
http://sound.westhost.com/amp-basics2.htm

and this about input
http://www.esafono.it/a700.pdf

BV · 3rd September 2008, 05:46 PM

Again wrong schematic. Try it this way..

Stee · 3rd September 2008, 07:09 PM

you are a little genius

divide the functions is the best strategy
compensates for the differences effectively

in the current stage need just put other two LEDs on input
maybe need also two capacitors like A700 diy gene

your simulator can also put resistor's value?

BV · 4th September 2008, 06:58 AM

Stee, we are reinventing wheel or ligt bulb

, it is nothing new on schematics.
Of course simulator can put values,
http://www.spectrum-soft.com/index.shtm
download, try it and learn to use.

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2nd September 2008, 10:36 PM	#2
kubeek diyAudio Member Join Date: Dec 2005 Location: Prague, Czech Rep	I don´t see it.

2nd September 2008, 10:50 PM	#4
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	The schematic is wrong. Output stayes at around 1.4 V. Also such a "spring" between collectors usually results is stauration of one of transistors. Adam

3rd September 2008, 12:25 PM	#5
megajocke diyAudio Member Join Date: Jan 2003	The "STD VAS" won't work correctly either. The upper part half of the circuit can't swing negative and vice versa.

3rd September 2008, 02:42 PM	#6
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	true

4th September 2008, 06:58 AM	#10
BV diyAudio Member Join Date: Sep 2005 Location: Trnava, Slovakia	Stee, we are reinventing wheel or ligt bulb , it is nothing new on schematics. Of course simulator can put values, http://www.spectrum-soft.com/index.shtm download, try it and learn to use.