If at first you DO succeed...

Try to hide your astonishment.

I posted last week about trying to get a Colpitt's oscilator working at 10 MHz, and several people generously offered insight and advice. I tried to respond that I was grateful, but had been staring at the damn thing for so long I was no longer able to see it, and was setting it aside for a couple days. That post unfortunately got lost in the ether. This weekend I went back to the oscillator, and immediately saw that I had the transistor in backwards (swapped E/C leads). Fixed that, and it fired right up. Used it to provide an input I could scope to the RF amplifier I built to assist my shortwave radio, and found that the coupling capacitor I put in to keep DC out of the tuning circuit was blown. Replaced that, and *it* started working.

Bedamned. Now I just need to get a 5 MHz crystal so I can check *both* frequency ranges, and rewind the toroids to get some overlap.

Thank you to those who offered encouragement and input. It helped me realize that I had become cross-eyed, and needed to do someting else for a while.


Reply to
Loading thread data ...

Well, you deserve more kudos for learning _how_ to approach the thing, more so than just having built an oscillator from a cookbook recipe. :-)

Cheers! Rich

Reply to
Rich Grise

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.