Are there any faults on this PLL Bug Tx?

[Willen]

I am here now- www.hem.passagen.se/communication/pll_bug.html

I am going to buy components from online. Before, want solve few problems like this-

1) I am confused about 12.8MHz Xtal OSC module, Is it 3 pin? Alll Xtals has 2 pin. If I said 12.8MHz Xatl with online sales and if they sent me "2 pin Xtal"?? He he he It will be a problem! Do you have its brand name? Do you have any picture os it? Please help me! I want through hole Xtal, can I?

2) If i used MP3 audio as an input, should I have to use Audio compressor IC SSM2167 (auto gain controller)?

3) In this circuit, will any VHF transistor like 2n2222 or 2n3904 work?

 

[audioguru]

The crystal oscillator module is an ordinary oscillator circuit module with 3 pins, not just a crystal.
Most of the ICs are surface-mount. Can you solder to them?
You probably do not need the audio compressor IC but you need to add a pre-emphasis circuit.
The circuit will probably work with a 2N2222 or 2N3904 but since the supply is only 5V then the output power will be low.

 

[Willen]

Wow! Thank you! I found a supplier which is www.yiqi-ic.com They are from HongKong. Thy are saying "we will send components from China post in almost $ 8 only if components are light in weight (shiping charge)" I think it is not very much! So I am trying to buy these components, also ROHM BH1417F IC (available there in almost $ 1.3 only).

Want to order LM2931A also, i think LM2950 is same.

I made a board layout of Mod 4 using ExpressPCB and made a board using Toner transfer method and got very fine results! Seeing this results, I hope I can make a board suitable for these small SMD components and if I can made board, Sure I can solder! If OSC module has no leads, than I will add leads like on electret mic because I don't have 'hot gun' to solder SMD components. Hope other chips has smaller leads for surface mount, may be I can work with them!

 

[Willen]

The crystal oscillator module is an ordinary oscillator circuit module with 3 pins, not just a crystal.

The supplier to whom I contacted, can't find the details about "12.8MHz crystal OSC Module (3 pin)" and 7.6MHz Xtal for ROHM FM IC too. Then asking with me to send details. But even I can't find any exact picture and datasheet!

Any Picture, datasheets, links do you have to show him? Specially the module.

 

[audioguru]

Most of the 12.8MHz crystal oscillator modules in North America are surface-mount with no pins. Digikey lists 10 of them.

Digikey is the largest electronics parts distributor in America and they do not list a 7.6MHz crystal. Maybe that is why Rohm does not make the FM transmitter ICs anymore.

 

[Willen]

Most of the 12.8MHz crystal oscillator modules in North America are surface-mount with no pins. Digikey lists 10 of them.

Digikey is the largest electronics parts distributor in America and they do not list a 7.6MHz crystal. Maybe that is why Rohm does not make the FM transmitter ICs anymore.

Can I use 7.6MHz Xtal OSC Module instead of 7.6MHz Crystal (applying suitablt voltage for module) on BH1417F?

 

[audioguru]

Can I use 7.6MHz Xtal OSC Module instead of 7.6MHz Crystal (applying suitablt voltage for module) on BH1417F?

EDIT: Pin 14 is the input of the 7.6MHz crystal oscillator.

 

[Willen]

EDIT: Pin 14 is the input of the 7.6MHz crystal oscillator.

You mean I can use, wow! I think this OSC module has also 3 connection
-Ground
-Positive suppy (may be +3.3V)
-Oscillation OUT

I should have to connect this 'Oscillation Out' to 14th pin of BH1417F. Hm!