| Electronics > Beginners |
| Signal Generator Clock Pulse Issue |
| (1/1) |
| JonPyro:
Hi All, I am trying to construct a test rig that will send clock pulses to some boards that have a 4013B flip flop wired as a latch. Rather than directly connect the output of a signal generator to the clock input I thought it would be fun just to add some extra complications and drive the clock pulse from a mosfet instead and drive the gate with my signal generator (Rigol DG822). This is the circuit: For my reference I have an LED also on the source so I can visually see the clock pulses get sent, however, an interesting thing happens. My signal generator is set up sending a PWM of 1hz and duty cycle of 10%: probed at the mosfet source: You will notice the first pulse is when I enable my sign gen output, you can see the rise time is much longer than the other pulses, here is the first pulse on its own: Here is the second and beyond pulse: This long first pulse is causing the 4013bs to go wobbly as its a invalid clock rise time but why does only the first pulse do this? I have connected my sig gen directly to my scope input and every pulse is perfect, so it must be my circuit to blame but I am not sure why. Any help would be appreciated. |
| radiolistener:
did you tried to remove LED to avoid output distortions? |
| JonPyro:
I have tried removing the 4013 boards and the led and it still has a slow rise on the first pulse. Interesting when I remove the led the waveform shows more overshoot and undershoot on the over pulses but the first is still slow. |
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