What the feel what like when you situated in the dark? Then, this TV-to-scope converter might be the tool you’re looking for…

Materials that needed:

  • An Oscilloscope
  • A LM1881
  • Sweep generators

TV to scope converter

If you refer to the above schematic, you’ll notice that the VGA-to-Scope converter has been simplified, while op-amp buffers and inverters were simply eliminated. The continuous current supply to charge up the capacitor can be replaced by a 1Meg pot from 5V to charge up the capacitor constantly. If you placing the pot at the right position, the capacitor will be charge up, and the trigger signal stopped the 555 to discharge the capacitor.

The function of LM1881 is to:

  • Separate the composite video to provide the vertical sync,
  • Composite sync to trigger the horizontal oscillator.

Few more things you need to caution:

  1. The oscilloscope must have a X, Y and Z axis.
  2. Video need to be connected before you turns on the brightness of the oscilloscope, and turn off the brightness before you shut down the converter.
  3. You’re better equipping it with a raster before you turn on the brightness.

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