Switch branches/tags
Nothing to show
Find file History
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Permalink
Type Name Latest commit message Commit time
..
Failed to load latest commit information.
assets
.catalog_metadata
README.md
StairStepGenerator.fzz

README.md

#222 StairStepGenerator

Generate a stair-step waveform with analog components.

▶️ return to the LEAP Catalog

Notes

Once again I'm inspired to go and build a circuit by yet another great tutorial from w2aew.

I won't try and repeat the circuit description here - see the video and attached notes. Suffice to say, it is quite an ingenious combination of 3 sub-systems:

  • a "high" (265Hz) frequency pulse (555 timer) provides the charge to step-up the output
  • the step pulse feeds an OpAmp pulse integrator/accumulator
  • a low frequency pulse generator (OpAmp oscillator) provides the reset pulse that clears the accumulator and resets the 555

I'm using an LMV324 opamp, which gives decent rail-to-rail performance. It has a maximum supply specification of 6V, hence I'm running the circuit at 5V only.

Performance

This is a trace of the circuit on a breadboard (a little noisy). But it works!

In this trace:

  • CH1: 555 timer signal
  • CH2: reset pulse
  • CH3: output

scope

Construction

Breadboard

The Schematic

The Build

Credits and References