Voltage Controlled Triangle Wave

225

03:43:17

Vary the upper left DC voltage source to vary the frequency of the Triangle wave.

published 5 years ago

fatcat2

5 years ago

Wow! Can we generate FM with this?

Sheen140

5 years ago

@Fatcat2 yeah theoretically you should be able to make a frequency modulated signal by varying the DC voltage source to modulate the signal, but it definitely wouldn't work up to FM radio frequencies unfortunately. The maximum frequency that I've been able to get a bread boarded version of this circuit to work at is about 1MHz

Sheen140

5 years ago

@fatcat2 also you'd probably want to have a sinusoidal output signal for any RF signal instead of a triangle wave (which is just made up of multiple sine waves of different frequencies)

fatcat2

5 years ago

Which BJTs did you use?

Sheen140

5 years ago

2N3904s so definitely not specially designed for high frequency!

fatcat2

5 years ago

I had asked this because I wanted to know high frequency transistor models. BF494 is a high frequency transistor. You may try that.

stanislav_maslovski

5 years ago

Interesting circuit!

Sheen140

5 years ago

Thanks @stanislav_maslovski !

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