hamilton1300

modified 12 years ago

Function generator refined. Now as close to 1k hz as I can get it

271

04:34:44

Green-----square
Red-------triangle
Blue------ sine

Give it a shake to get it going. It will need a few second to stabilize

published 12 years ago

sarav_1994

12 years ago

No source in the ckt

hamilton1300

12 years ago

It is in equilibrium until you inject noise

UncleRick

12 years ago

Very true Hamilton. I'm embarrassed to say that I sat and waited for something to happen, for 1 or 2 minutes. Then I shook my device and yelled, "GO!" and it did. ;-)

UncleRick

12 years ago

One drawback to the generator. A change in frequency will render some wave forms to become distorted or incomplete.

hamilton1300

12 years ago

True, you would have to change the CR filters to tune it to the new freq. Also changing the resistance of the filter in the second element will modify the waveform. It becomes more like a sawtooth

hurz

12 years ago

Another drawback is the sinwave which contains a lot harmonics from principal of integrating twice is a sqr function and only close to sinus. But all in all its a usefull littel and cheap function generator for beginners its perfect. I had those long time ago.

hamilton1300

12 years ago

It turns out that Forest Mimms published one a loooooong time ago. His had two amps in the sine wave portion of the circuit.

hurz

12 years ago

No, as far as i can see Forrests FG is equal to this

ShortCircuit

12 years ago

Wonderful, would be useful in an event where you need a timer

hamilton1300

12 years ago

A 555 would prbly be better. Fewer parts for sure

hurz

12 years ago

Or xr2206 or 8038 there are some old ICs which just need a few external components and they do the rest for you. But today I would prefer e.g. a cheap Arduino Due plus some SW

ShortCircuit

12 years ago

Well, that would be more compact, but less fun

hamilton1300

12 years ago

Both true

hurz

12 years ago

agree

ShortCircuit

12 years ago

Hey hurz, if you read this, this has been bothering me for a bit. Is hurz your name or is it a misspelling of hertz like google is of googol

yra

10 years ago

A function generator app and a Android phone with a audio amp as a buffer circuit.

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