Indicated signal with a radio pench---tvoscph.gif
TV-Oscilloscope
Adapter 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. Therefore it is not so useful. But I think that this circuit is very good sample to learn about OP amp circuit. If you can not understand my explanation. Read the textbook of the OP AMP! I think this circuit is good to be used to educate on the technical school. For this purpose , I will give you some home works. 1.Use Vcc and Vee! Use two power supply, in order to indicates minus DC voltage! 2.Make the line on the indicator more slim! 3.Make the vertical sweep oscillator! Trigger the sweep by the input signal!
tvosc.gif
