Gieskes Oscillatoscope1

So as usual Gieskes has come out with something cool the Oscillatoscope1
http://gieskes.nl/visual-equipment/?file=oscillatoscope1#p10

TV Oscilloscope Adaptor

TV Oscilloscope Adaptor from here

This is an adapter attached to a TV set. This machine changes a TV to a Oscilloscope. See the photo! This photo indicates a sine wave 50mV 120Hz. See the circuit! Free oscillater makes an 15kHz pulse signal (A). This signal is amplified by an buffer AMP. On the other hand , an amplifier makes 300 times of input signal. And it is shifted to 6V center. A comparater compares a voltage (C) and (B). this comparater makes an pulse width modulated signal on (D) point. Differencial circuit makes a small pulse on the changing timing of the pulse. Buffer receives two signals ,(A) and (E). Therefore it is called as an adder. This machine is able to indicates only 60Hz or 120Hz or 180Hz

Video Oscilloscopes !

Some very expensive digital oscilloscopes have composite outputs, if like me you can't find one cheap there are a few other products on the market to fit the bill.

The very cool Critter and Guitari Video Scope produces colourful NTSC video for $99

For us Europeans the MFB VD-01 Videoscope synth module gives a more traditional black and white PAL scope image for €159.

Both units give a slightly blocky output unlike a real oscilloscope image but they could both find a home in a hardwarevideo set up. They also eliminate the need for rescanning a normal oscilloscope screen (which has its own charm but demands space and equipment). 

Here is an excellent video from DamagedMeat on youtube illustrating the MFB VD-01's potential