TGSL Tuning & troubleshooting

[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

[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 ...

[Davor]

USB oscilloscope on ebay

http://www.ebay.com/itm/2-Channel-PC-Computer-Digital-Storage-USB-Oscilloscope-/121101180766?pt=BI_Oscilloscopes&hash=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]

New setting on pots in souncard probe scope

[sdesic]

USB oscilloscope on ebay

http://www.ebay.com/itm/2-Channel-PC-Computer-Digital-Storage-USB-Oscilloscope-/121101180766?pt=BI_Oscilloscopes&hash=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]

xy graph
tx and pin 7 GB


two channels - tx and pin 7 393

[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"...

[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.

[sdesic]

Gate of lower


and upper BF245

[sdesic]

Ground balance part - pin 7 LM393

[sdesic]

here is screenshot of pin6 of 4024

[sdesic]

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

[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]

If it matters here is one made in goldwave 96k sampling
it is audio software so I don't know what sapmle it is ... 9s or something else ...

[sdesic]

and two more from RX preamp point on pin7 LF353