TGSL Tuning & troubleshooting

[Davor]

Guess you already see the point - use the smooth signal representation. Digital sampling oscilloscopes go to great lengths to make the sampled signal bearable to watch. For an amateur a good old cathode ray oscilloscope is a premium.

[sdesic]

is it OK for signal to look like that ? TX and RX ?
problem is not there ?

[sdesic]

here is screenshot of pin6 of 4024

[sdesic]

Ground balance part - pin 7 LM393

[sdesic]

Gate of lower


and upper BF245

[Davor]

As for GB you can use the x-y graph and connect either Tx or Rx pin 7 to the second channel to observe effect of phase adjustment.

[der_fisherman]

Guess you already see the point - use the smooth signal representation. Digital sampling oscilloscopes go to great lengths to make the sampled signal bearable to watch. For an amateur a good old cathode ray oscilloscope is a premium.

....and very cheap secondhand on ebay......especially if one channel is enough and a two channel scope is missing one channel (as can be the case!), you can pick them up for "Peanuts"...

[sdesic]

xy graph
tx and pin 7 GB


two channels - tx and pin 7 393

[sdesic]

USB oscilloscope on ebay
http://www.ebay.com/itm/2-Channel-PC...item1c32315f5e

BAD:
does not work with Windows 7

Max sampling: 8kHz x 1/ (4kHz x 2)

Measurable frequency: 0Hz -----3kHz

Max voltage: 0---5V

[sdesic]

New setting on pots in souncard probe scope

[Davor]

USB oscilloscope on ebay
http://www.ebay.com/itm/2-Channel-PC...item1c32315f5e

BAD:
does not work with Windows 7

Max sampling: 8kHz x 1/ (4kHz x 2)

Measurable frequency: 0Hz -----3kHz

Max voltage: 0---5V

This is useless.
See the Win7 compatibility problem? Useful lifespan of such devices is 10 years max. My CRO is over 20 years old, and it will most probably serve me for 20 more. The best investment one can make.

[sdesic]

I know people who are looking for old computers because they have old diagnostics for cars
which is working only up to 200 MHz win95 or so
com ports and DOS also ...

[sdesic]

Done one more graph with tx and pin7 on two channels with three variations of GB




nex I'll try something which is not sine... gate of TR4... with max and min GB

[Davor]

GB will only change phase so I suggested you to try x-y plot where it is visible.

Try to replicate situation where you have the delay after turn-on, and seek a waveform that turns on with it. Once you find it yoi'll know what causes the delay.

[sdesic]

Used TX and pin7 on X-Y graph
made it pretty adjusted phase so few lines are drawn ... I think
as I don't know what I am doing
GB on max (down)
K1 and K2 connected