Pititico CW Transceiver - An Affordable Way To Get On The Air

Pititico CW QRPP transceiver designed for the 40m band. One of the smallest QRP transceivers designed around one 2N2222 transistor by ‪@py2ohh‬
73, YO6DXE
*** BLOG POST:
dxexplorer.com/pititico-cw-tr...
*** PCB BOARDS:
www.pcbway.com/project/sharep...
*** NEW VERSION ( Pititico II ):
• Pititico II CW Transce...
• Pititico II CW Transce...
*** MORE ON PITITICO:
• Improved Pititico CW T...
*** SUPPORT DX EXPLORER:
www.paypal.com/donate/?hosted...
*** Check the DISCOUNTS page on the blog:
Discount codes for various products and services offered by partners and collaborators.
dxexplorer.com/discount-codes

[@TheArtofEngineering]

Even your “ugly” circuit build is a thing of beauty …. You are a circuit surgeon!! Love the simplicity.

[@dxexplorer]

Hahaha... thank you. I agree with you too... I also love the simplicity of this one. 73 my friend.

[@drewnianyklocek3724]

I was already afraid you forgot about the radio. It's fantastic that new material has finally appeared! The El Pititico CW Transceiver looks great in this wooden box. Manhattan Style :D Regards, buddy! 73!

[@dxexplorer]

I have such a long list of projects to get back to buddy ))) It feels good to be back. 73 my friend.

[@Steve-GM0HUU]

👍very nice homebrew and impressive output power. Thanks for sharing and Happy New Year.

[@dxexplorer]

Happy New Year Steve. I'm also impressed with the power output hehe. Time to build some more now that I'm haply with the results on this one.

[@multilecful]

Good to see you back my friend. Nice job on the spy radio. It already looks like it's been in a war zone 🤣

[@dxexplorer]

Thank you Nigel. Ohh yes.. a war with the soldering iron and the flames burner hahaha. Just like in war times hahaha. 73... we chat on email later on today.

[@bhz44]

Adorei o Pititico! É como chamo meu filho pequeno!😂

[@dxexplorer]

Eu também adoro haha. Até o nome o torna fofo. Quero construir versões para todas as bandas de 80m a 10m e ter uma de cada. Mas o Pititico II que fiz para incluir o amplificador de áudio não é mais tão pequeno. Ainda é divertido construí-lo e colocá-lo no ar. 73, YO6DXE.

[@madcarew5168]

Do appreciate a well made and packaged radio..very nice!!

[@dxexplorer]

Thank you so much. I really like as well how nice it turned out. I managed to write the "El Pititico" on the top cover as well and it looks even better now )) Thank you one more time. 73

[@sjoerdverhiel7215]

Thanks for the video happy new year to you too

[@dxexplorer]

Happy New Year to you as well my friend. And thank you for watching as well. 73

[@acestudioscouk-Ace-G0ACE]

Hi Ciprian, Good to see you back and Happy New Year to you and yours! I've been checking to see if you have posted a video and am glad to see this one. Looking forward to seeing more in throughout the year. Best 73.

[@dxexplorer]

Happy New Year my friend. I'm also happy to the back. And I also have a long list of projects to make videos about... I'm behind with the ones from last year... so the list got bigger ))) 73 my friend.

[@joyahamradio]

such a soulful design

[@dxexplorer]

I like old radios in wooden boxes... and simple schematics. This one is a combination of both 😄😄 Thank you my friend. 73 DE YO6DXE.

[@on6uufrank]

looks superb, nice cabinet.

[@dxexplorer]

Thank you my friend. Ohh yes I'm happy I found that little box. 73

[@ka2pbo]

Great video ! I just found your channel and having great fun and finding some new QRP build ideas. Thank you for providing the files . I cant wait to give this a try . 72 & 73 !

[@dxexplorer]

I did not had much time for the hobby layely... but I will be back with more pretty soon. Glad you like it.. as I also like playing with all sort of simple schematics and make the videos )). 73 DE YO6DXE.

[@janetwinslow2039]

Great simple circuit. A capacitor across the headphone jack will remove some of the unwanted high-frequency audio.

[@dxexplorer]

I love these simple circuits too. Ohh yes that is a great idea... the capacitor I mean. I didn't tried it as I removed the high frequencies in the external amplifier I'm using 😁

[@markmelchiori511]

Hello Ciprian, and happy new year to you. I enjoy your videos and projects and I especially liked this project so I built your version of this last night. The RX works as expected but as you discussed, my TX is heating up and shifting frequency after a second or two of key down. Having seen your success, I will continue to work on mine until I can get it to work. I will make it a point to report my findings and experiments to you. Thank you for sharing your projects with the community and 72's de N9AK...

[@dxexplorer]

Happy New Year Mark... and thank you. I'm glad you like the videos. Today I was lucky and the propagation was great so I had amazing reception on the little guy. I will somehow insert a short clip in the next video. About the transistor heating... you did used a dummy load right ? )) And yes it does get a little hot... especially on 12v with 1W output power. Check the transistor and if you can measure the Hfe over 450 and the Uf around 650 or over. I tested a lot of 2N2222 transistors and the Chinese ones are with an Hfe less than 250 most of the time. Those seem to be unstable and overheat excessively. I hope you get it figured out. I still can't believe mine works so well. Now I just have to build a little amplifier for it so I can use regular headphones. 73 my friend and let me know how things work out for you.

[@DIYElectronics123]

I would like to see the entire process of the project from creating the enclosure to installation. This is really nice. I'm wondering if the same circuit could be applied with a transistor like 2N2219 or BD135. I doubt BD135 would be good for receive

[@dxexplorer]

2N2219 and BD139 work pretty well. Unfortunately for the entire process I have very little time now. Maybe a little later in the autumn time.

[@4youian]

Hi Chip, thanks for another inspirational video. Great to see you back. I really need to learn Morse code and give this a try! Happy New year, Ian, VK7IAN

[@dxexplorer]

Happy New Year to you as well Ian. Then I have a feeling you may like the next video then ))) I sure must do the same as you. I remember very little of what I've learned twenty years ago. Hopefully is like they say about riding a bicycle hahaha. 73 my friend.

[@sm3981]

Good job Sir! 73 from PU2YIS Sao Paulo Brazil

[@dxexplorer]

Thank you. I have one more video coming on this with the latest modifications I made to it 😁😁. 73 DE YO6DXE.

[@patriciadescheemaecker4613]

Again amazing....nice tressure

[@dxexplorer]

Thank you Patricia. Sorry for the late reply. You already know... not much free time for me )) Hugs.

[@NamasenITN]

So "transceiver" here is used as a synonym of "transmitter" and not of "transmitter + receiver". Correct?

[@dxexplorer]

No... is an actual transceiver as transmitter + receiver. But have a look at my latest videos as I have a new version.

[@danamarcy5414]

Looks very cute and small. Good to see your back. :-) Ve6KBI Dana

[@dxexplorer]

Good morning from Transylvania )) It feels very good to be back. Hehe I also like how it turned out. Now I just have to build a tiny amplifier for it and I'm good to go )) 73 and have an amazing week.

[@yusup3199]

Nice sir..I find for my equipment when hiking thanks to share schema.. how far range it can be reach?

[@dxexplorer]

Have a look at the latest video... or the article on the blog on Pititico II. It also has the LM386 audio amplifier included so you can use regular headphones. The range.. it depends on the propagation. With 700mW you can sure make QSO's all over Europe in a good day... or no QSO at all if the propagation is not good )). 73, YO6DXE.

[@maalos]

which values need to be changed in order for it to work on 80m? - around 3.58MHz

[@dxexplorer]

I didn't tested that yet. I will try to make an 80m version as well and I get back to you.

[@vivekchauhan7468]

Hii is there any way to replace crystal with VFO?

[@dxexplorer]

I thought so too... but I think the VFO has to be a good one. The circuit is really simple so it will may pull the VFO frequency really easy when transmitting. But then it would be no more simplicity in the circuit ))). I am trying to work on something else that also includes a VFO... but it will take me a little as I don't have so much free time.

[@vivekchauhan7468]

I got the point 😊 and waiting for it.

[@dxexplorer]

@@vivekchauhan7468 Sorry for the late reply.... the comment keeps going into "likely spam" from KZbin. Not sure why. Ohh yes I cannot wait to have some time to play and see how that would work.

[@deathstalker7344]

Can i use 7 mhz crystal to 8 mhz crystal ?

[@dxexplorer]

What do you mean 7MHz to 8MHz ? Like any frequency between 7 to 8 ? 8MHz is no longer into the amateur radio bands so is illegal. The Pi Filter on the input is normally adjusted to be used for the CW portion of the 40m band ( 7MHz )... so usually you would use a crystal more common for the QRP calling frequency something like 7.030MHz. I hope that was the question )))

[@deathstalker7344]

@@dxexplorer thanks for understanding me