#123: Build a crystal oscillator from schematic thru prototype construction and testing - DIY

HI, i have the same frequency counter, LDC-821S.
Great Japan tube display instrument!

Great channel, cheers from Uruguay.

Awesome work. It would be really cool to have an island cutter that also drilled a through hole in the center. That way you could just stick the leads through and solder them up trimming afterward. With a double sided board you could even use a combination of drilled and not drilled to make the back side a power plane..... Maybe

I built this circuit, and it works. I didn't have my yuppy 'Upper East Side Manhattan' hole saw handy. I just cut up a grid of small 5mm square islands from the copper clad and hot glued them 'Haarlem 'n Handy' to the ground plain board.

Hope your feeling better Alan and the ankle is healing quickly ;)

what would happen if i were to usea darlington transistor to increase the output voltage and current?

what is reason that You build prototype like this ? you have some film where you explain this ? i like this method

Thank-you for an excellent video. The example circuit shown is very similar to G3UUR's method for measuring crystal motional parameters of fundamental mode quartz crystals, lacking a switch and a 33pF jumper (Re; EMRFD page 3.19). Would you consider making a video demonstrating how to test crystal motional parameters? 73

man, why does everything look shortcircuited?

socketstrip

Hello, Its really very helpful info. Thanks A lot.
I do have one question that I have one microphone Tx works on 171.905 MHz. and I have FM wireless Rx works on 170.245 MHz. I want change frequency of Tx to match Rx. But I saw there are 02 crystals in Tx circuit but I am not sure which one needs to be change and also I could not find any frequency crystal online same which I need. Is there multiplier or something. please find below link for images. Please put some light on it. Appreciate your time and effort. Thanks
http://imgur.com/a/a1xQk

Great idea the hole pads.

Thanks for idea.

Buy an arduino boardor build one, then connect it to 3-5 servo motors.Then you'll be rid of burning yourself.

HOW MANY MILLA AMPS PER HOUR WILL THIS DRAW ON A SQUARE 9V BATTERY WOULD IT LAST LONG AND HOW FAR WOULD IT TRANSMITT ??

http://img.photobucket.com/albums/v230/ryan_03/20160713_2316021_zpsqo8pu1e0.jpg

built on a vero board with smd components.. works great!

Seems like a quick and easy construction method. Thanks.

It works fine, although the output amplitude seems to diminish a lot with frequency, for a 8MHz crystal I get around 2 volts peak, for a 16Mhz I get 450mV peak, and for 20MHz I get around 100-200mV peak, maybe it needs an amplifying stage.
I also tried with some crystals in the kilohertz range taken from alarm clocks but they don't appear to work.
https://imgur.com/a/912bP
PS: I know the 10nF capacitor is missing after the 100Ohm resistor, I added it afterwards.

Nowadays I prototype with SMD components. You require a magnifier but with the correct proto board it's really quick and easy.

Hmm? So that is the Manhattan style? Okay then, interesting, and quite effective. Not quite as crude as "dead bug style". I was etching boards with ferrichloride when I was about 10 years old. Any lacquer based marker makes a resist pen for the etching fluid. The "Industrial" Sharpie is one that works really well, and for RF shielding dead copper / large ground planes, just brush on some lacquer paint. My first hand rendered through hole PCB artwork, taken from a schematic, for etching was the Fender fuzz wah/volume & tone pedal for guitar. It had an op amp, or two, and a couple transistors, & all the passive stuff. Not a great choice, but it works, more or less. The combination rocker & twist pedal case proved impossible to locate or build without some difficulty.. My very first PCB was taken off a photocopy, of the PCB traces & pads. It was a bootleg pay television descrambler. I used dry transfers on it. What a tedious pain in the neck, only lower! 73 KI7AQJ

Alan,great video as usual. Where can I get the sockets that you use to hold the crystals?

I love it w2aew ... thanks il's a Very nice video, please tell me can i use this circuit with a variable capacity " Cx " in the place of the crystals to post the variation of the frequency ?

Thanks for the video

if I wanted to have an inductor added to your circuit, where would I add it.

I tried to add one in parallel with the two capacitors, but I am not getting any oscillation

Regards