Ultrastable 1.5V microsized UHF transmitter

[@blechhammerer4008]

Lieber Tom, ich habe deine verschiedenen Sender erst jetzt gefunden und nutze deine grossartigen UKW und UHF Vorlagen, um den heimischen SMD-Prozess auf Vordermann zu kriegen, insbesonders die 01005 Bauteile sind eine herrliche Herausforderung. Ich selbst beschäftige mich seit den 1970ern mit Kleinsenderbau, seit 1990 auch in SMD. Für einen Modellraketenverein entwickelte ich in den 1990ern einen Gegentakt-Ortungssender im UKW Band, der bei etwa 500mW lag und auch an die ueblichen Fernsteuerungen mit Data & Versorgungsspannung angeschlossen werden konnte - dieser schaltete sich selbstständig ein, wenn die Fernsteuerungsignale ausblieben. Gewicht ca. 7 Gramm. Im Moment bearbeite ich dein Layout des kleinsten Bugs (6.8x4.75mm) etwas nach, um verschiedene Keystone Knopfzellenhalter einzupassen, er wird dadurch etwas grösser, 5x8mm. Ich habe noch viele ZnAir Hörgeräte Knopfzellen übrig (312), diese verfügen über wesentlich höhere Kapazitäten bei etwas geringerer Spannung (1.4V), was wiederum die "Schutzdiode" überflüssig macht 🙂. Diese passen dann auch auf die 5x8mm Leiterplatte, allerdings mit Drahtbügel. Was mir noch auffiel: Du sprichst fließend und akzentfrei deutsch, englisch und französisch? Bist du ein gebürtiger Deutscher (oder die Eltern sind es?) und wohnst im Osten von Kanada? Cool, wenn man 3 Sprachen beherrscht - mein Schulfranzösisch ist eingerostet nach den vielen Jahren, kommt aber wieder wenn in Urlaub in F. Vielen herzlichen Dank für deine Beiträge - mich haben sie motiviert, meine Grenzen neu auszuloten. Thomas Grande, 62, Berlin, Germany

[@billewood]

I don't see the antenna listed in your parts list- could you suggest one for me? I also don't see the battery holder listed, but I can figure that out. Very cool thank you for posting!

[@tomtechtod9200]

The antenna is a 1/4 wavelength long. Just a wire

[@kevinm.8808]

Could it be that there is a small mistake? In the schematics there is C4 while on the board is L2. I assume it’s the same just accidentally named different?

[@jameshauser1507]

Excellent Tom.

[@technicalcarbon734]

can it send/receive audio as an intercom? Sorry I am not a Professional

[@tomtechtod9200]

only send

[@samhozen4024]

very nice and small,where can this be bought ready made?

[@tomtechtod9200]

I don't sell those. Sorry

[@anujregmi4582]

can we use the camera with transmitter and send the video and audio clip. I mean to more precise like using the camera and voice inside a pen and seeing it from a distance..

[@tomtechtod9200]

Anuj Regmi possible with the right budget. There are tiny camera cube modules with analog output but are expensive...

[@anujregmi4582]

After i connect the analog camera and the microphone in the circuit you have shown, how would i see the video. I didnt find any video about that. There are very few video about diy CCTV. Can you please suggest something....

[@tomtechtod9200]

you can not just connect a camera to the circuit in this video. Theoretically you could buy a mini endoscope camera of about 4mm diameter, 20mm long that has composite video output and modulate a high frequency carrier with it. This could then be received with a common TV set. But, first, these cameras cost at least $50 US, second, they draw a lot of current, nothing a 4.8mm mini button cell could provide, and third, for UHF you would have to develop a stable transmitter of 470 to 800MHz (for UHF). Doable? Yes. Easy and cheap? No. These cameras are available on Aliexpress for example

[@ahmedsalam5705]

It's seem ready made. How to get it sir?

[@JeremyCook]

Seems a little big... Seriously though, impressive work!

[@pajxyeemvaj7707]

May I ask, can I change the frequency? How can I do that? Thanks in advance and appreciate it.

[@tomtechtod9200]

the frequency depends on the SAW oscillator, it's fixed, so you would need to change that plus a couple of other components.

[@laurine8810]

Nice engineering Job Tom! One question that's been on my mind though: Do you adjust the frequency slightly with L3?

[@gedmccole6143]

can i buy your ultra small transmitter.please let me know and details off where i can buy,thanks tom.u legend

[@tomtechtod9200]

Sorry, no, I don't sell this stuff, You will need to either build one for yourself or find somebody who does it for you.

[@mohammadalfauomey3443]

nice what about the range of it? Thanks

[@tomtechtod9200]

Mohammad Alfauomey probably not more than 150m LOS with this receiver/antenna

[@mohammadalfauomey3443]

TomTechTod Thanks very much

[@magiermexico]

Im really interested! Can you sell me some units?

[@tomtechtod9200]

Sorry, no. You can build them though

[@tomtechtod9200]

BAT1 KEYSTONE2994 36-2994-ND D1 SMV1248 863-1623-1-ND Q1 BFR360 BFR360FH6327XTSA1CT-ND Q2 MMBT3904SL MMBT3904SLCT-ND Q3 MMBT3904SL MMBT3904SLCT-ND MIC ICS-40310 1428-1028-1-ND X1 B39431R960H110 495-2392-1-ND

[@YEMinThant-gv1my]

❤❤❤❤❤

[@magiermexico]

Can you sell me 1 ?

[@tomtechtod9200]

sorry, I don't sell those.

[@magiermexico]

TomTechTod 😔 why? I need 10 units!

[@tomtechtod9200]

@@magiermexico sorry I don't have time for this. there is a guy on KZbin who sells spybugs

[@magiermexico]

TomTechTod i understand, great do you know his account?

[@tomtechtod9200]

@@magiermexico dazaro3. Idk his products though. You find stuff on ebay too.