Search found 5 matches

by samt_32
Wed Aug 13, 2014 12:05 am
Forum: General Discussion
Topic: microcontroler circuit design question / new digital scope
Replies: 7
Views: 2061

Re: microcontroler circuit design question / new digital sco

Well I think I figured out the problem. The two resistors that I mentioned were 10 times to small (4.7 K instead of 47K and 2.4K instead of 24K). The problem seems to be fixed now and the circuit does not respond to the 555 timer circuit at all. Thanks for the help.
by samt_32
Sat Aug 09, 2014 10:36 pm
Forum: General Discussion
Topic: microcontroler circuit design question / new digital scope
Replies: 7
Views: 2061

Re: microcontroler circuit design question / new digital sco

I have yet to see a used 1Gsa/s scope for around $350 in my neck of the woods (Calgary). That is why I brought up the Rigol or other similar China made scopes. I am wondering if I could try to catch the glitch with my current scope by using a camera set to a long exposure time and then see if there ...
by samt_32
Wed Aug 06, 2014 10:10 am
Forum: General Discussion
Topic: microcontroler circuit design question / new digital scope
Replies: 7
Views: 2061

Re: Tektronix 465 scope / micro input question

Thanks for the info. The Atmel micro (a 90usb162) runes at 16Mhz from a external crystal oscillator and I can see a lower frequency micro square wave of it on the input lines as well as the 5 Volt regulated and filtered input. This signal is more prenounced on the new board layout then the old one. ...
by samt_32
Tue Aug 05, 2014 7:43 pm
Forum: General Discussion
Topic: microcontroler circuit design question / new digital scope
Replies: 7
Views: 2061

Re: Tektronix 465 scope / micro input question

That is not an option. The 555 timer circuit is supposed to simulate a can-bus tail light signal so it can't change.
by samt_32
Tue Aug 05, 2014 4:42 pm
Forum: General Discussion
Topic: microcontroler circuit design question / new digital scope
Replies: 7
Views: 2061

microcontroler circuit design question / new digital scope

I have a adjustable duty cycle 555 timer circuit that has a 25% duty cycle signal with a 83Hz frequency at around 12 Volts peak to peak. I am inputting the 555s square wave into a Atmel micro through a 100Mhz ferret bead, 4.7K resistor, 1uF ceramic cap to ground and a 2.4K resistor to ground. The 4....