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Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
So that I no longer have to get annoyed with a loose oscillator chip being dragged around on its back by alligator leads, I rigidified it. You can adjust the pots without a screwdriver now, too. ^^
Screws, nuts, spacers and hardware are from my "mixed hardware bits" box. Heatsink, regulator, diode and cable are from my "dead monitors" heap. Potentiometers and sockets are from my "mixed ex-audio crap" tray. Board and chips are from my "dead & superseded TC drivers" collection. Acrylic was cut from offcuts in my 25W CO2 lasercutter. =-)
It swings from ~2MHz to ~22MHz before the squarewave gets too ugly.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Here's my version I made years ago.
I had big trouble finding proper oscillator, I tought simple logic gates would be best approach but signal detoriated very quickly. (and duty cycle was fixed).
So I just rated it 1Mhz and stuffed in powerful push-pull stage so I can drive something.
Electronics are subject to changes but it served me well most of time. If I come into need I'l probably build some more serious waveform generator, although I didn't really need much better than this!
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
Nice! I need to build a new one of these, quite handy things to have around. The last one I built was a 5 minute job and I somehow blew it up on the first use
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
He cheated and used a max038 to do the signal generating. Unfortunantly they are about as hard to find as left handed bacon stretcher these days (the plant that they were made at is no longer owned my maxim)
Looks good in any case!
I want to make something like this, and since I do have a max038, it shouldn't be very much work... I just want to find a way to really protect the chip (I am considering feeding it into a little telecom laser I have, and fiber coupling it should be good to ~10ghz) Some day...
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
My plan would be getting HC version of 4049 chip (18Mhz) used with 89C2051 mcu, as a precise software-controlled frequency syntesizer.
Simple logic multivibrators don't work as well as I tought - they are simply ''too weak'' to push sharp square edges well into output capacitances, so I need to find a powerful output driver to get a decent signal (these are hopes for that grey-box generator).
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
I love the frequency counter, Hazmatt -- that was the first thing on my mind when I was building this, but I think I'll have to make do with my frequency-counting mulimeter for now.
Firkragg wrote ...
Sometimes it may be worth to afford something faster from DEI for such use...
''Dad, I want a CNC CO2 laser!''
Quit making snide remarks about my apparent wealth, already.
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cheap thrills signal generator
should be good to ~10ghz) Some day...
