Square Wace Oscillator

[michael_circuit]

Square Wave Oscillator

Hello all,
I'm sure this question has been answered many times here at electro-tech. I built this simple square wave generator (link provided below) and I cant seem to get amplitue to appear on my oscilloscope. I just get the baseline and leading/trailing edge to appear. so basically top and bottom but no sides.

heres is a perfect example of whats happening

https://www.amplifier.cd/Verstaerke...i_Verstaerker_Test/images/Slew_Rate_Inp_1.jpg



6v in

R1 = 100k also tried with 10k but with no success.
R2 = 100k
R3 = 100k
R4 = 100k
C1 = .01 uf

there is a 1k resistor connected to Vin. instead of the 10k depicted.

schematic provided below

https://schematicwiring.com/wp-cont...sing-comparator-circuit-schematic-diagram.JPG

 

[ChrisP58]

It is probably just that the rising and falling times are to fast for your scope to display. The 'sides' are there, or you wouldn't have a top and a bottom.

 

[JimB]

Exactly what Chris said.

JimB

 

[davenn]

Hello all,
...............I cant seem to get amplitue to appear on my oscilloscope. I just get the baseline and leading/trailing edge to appear. so basically top and bottom but no sides.

You have the amplitude displayed.... its showing as 4 divisions (between the top and bottom horizontal lines) the value of which is 4 x whatever the mV,V etc / division are set for

Now I see 500mV in the top left corner.... maybe thats 500mV / division, so your amplitude is 2V

Dave

 

[bloki]

Lower your time base to 50us and observe only pulse rise or fall. You will see it.