Ti-83 plus wireless link circuit help - Page 2 - Electronic Circuits Projects Diagrams Free

arigold125 · 17th March 2006, 09:04 PM

i found schematics at http://users.aol.com/timagazine/arch...y96/rtlink.htm I dont know how well this system works and am trying to build it as we speak, but am having difficulty finding all the peices for within the $15-20 suggested price range. anyone who can provide assistance of any kind, it would be greatly appreciated.

arigold125 · 18th March 2006, 11:20 PM

anyone know where i can buy the coils required for this project to work or of any other projects or pre-built systems that would give the ti wireless capability?

audioguru · 18th March 2006, 11:40 PM

It is only a VHF transmitter, something like a toy FM transmitter, and a crystal AM VHF radio receiver.
The coils could be just about 10 turns of enamelled wire with a 3mm air-core.

arigold125 · 19th March 2006, 09:06 PM

do you think itll work?

DigiTan · 21st March 2006, 03:11 AM

Yeah, audio. Do you think it can work? Or what would you recommend?

audioguru · 21st March 2006, 04:41 AM

Do I think a toy transmitter will transmit very far to a toy passive crystal radio when their coils have a capacitor across them with a value spread of 10:1??
An good inexpensive set of 433MHz transmitter and real radio would be much, much better.

DigiTan · 22nd March 2006, 06:00 AM

Could you modify the current design for better performance (maybe starting with the reciever)? This looks like a cool RF project, and I'm not really learning much with these store-bought 433MHz's.

22nd March 2006, 03:32 PM

Hi
You can do it with a pic (or basic stamp) and a transmitter chip from LINX which has a range of over 3000ft. Your TOTAL parts count is 6 for the whole thing. And the cost, if you use the pic, will be less than 15 dollars.

http://www.linxtechnologies.com/

22nd March 2006, 04:11 PM

OR...... you could use an rfPIC (like the rfPIC12f675) which is a microcontroller and a transmitter all in one! Ive never used one, but I want to soon!

**Nigel Goodwin** · 22nd March 2006, 05:38 PM

Quote:

Originally Posted by hyedenny

OR...... you could use an rfPIC (like the rfPIC12f675) which is a microcontroller and a transmitter all in one! Ive never used one, but I want to soon!

I suggest you study the datasheet - it's not easy or cheap to use!.

DigiTan · 22nd March 2006, 08:45 PM

Yes, I have the AVR equivalent of those chips-- the AT86RF401. But I don't think these modules are really advancing my understanding of RF circuit engineering. I'd prefer to do it with discretes if possible first--like audio's RF voice transmitters.

**Nigel Goodwin** · 23rd March 2006, 09:18 AM

Quote:

Originally Posted by DigiTan

Yes, I have the AVR equivalent of those chips-- the AT86RF401. But I don't think these modules are really advancing my understanding of RF circuit engineering. I'd prefer to do it with discretes if possible first--like audio's RF voice transmitters.

The licence free radio modules are just that, 'licence free', if you build your own presumably you will have to either get a licence for them (probably impossible?) or submit them for licence free testing (probably EXTREMELY expensive).

DigiTan · 24th March 2006, 04:55 PM

If it's on the AM broadcast band, longwave (within only 160 to 190 kHz), or CB band (within 26.96 to 27.28 MHz we're allowed 100mW from the FCC part 15 rules. So how about it? Can you guys help me out?

DigiTan · 28th March 2006, 01:23 AM

I take it from the 3-day silence no one can help.

[edit]

If it helps, I'm just curious about:

1. Will the posted design work? At all?
2. If not, what's okay and what isn't?
3. Shouldn't the transmitter/reciever be isolated somehow? Like with a duplexer?

DigiTan · 29th March 2006, 04:35 AM

Why won't anybody help me? :cry:

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17th March 2006, 09:04 PM	(permalink)
arigold125	schematics i found schematics at http://users.aol.com/timagazine/arch...y96/rtlink.htm I dont know how well this system works and am trying to build it as we speak, but am having difficulty finding all the peices for within the $15-20 suggested price range. anyone who can provide assistance of any kind, it would be greatly appreciated.

18th March 2006, 11:20 PM	(permalink)
arigold125	anyone know where i can buy the coils required for this project to work or of any other projects or pre-built systems that would give the ti wireless capability?

18th March 2006, 11:40 PM	(permalink)
audioguru	It is only a VHF transmitter, something like a toy FM transmitter, and a crystal AM VHF radio receiver. The coils could be just about 10 turns of enamelled wire with a 3mm air-core. __________________ Uncle $crooge

19th March 2006, 09:06 PM	(permalink)
arigold125	do you think itll work?

21st March 2006, 03:11 AM	(permalink)
DigiTan	Yeah, audio. Do you think it can work? Or what would you recommend? __________________ The most-hated young engineer in America. * AVR Projects * Robot War: TI * About

21st March 2006, 04:41 AM	(permalink)
audioguru	Do I think a toy transmitter will transmit very far to a toy passive crystal radio when their coils have a capacitor across them with a value spread of 10:1?? An good inexpensive set of 433MHz transmitter and real radio would be much, much better. __________________ Uncle $crooge

22nd March 2006, 06:00 AM	(permalink)
DigiTan	Could you modify the current design for better performance (maybe starting with the reciever)? This looks like a cool RF project, and I'm not really learning much with these store-bought 433MHz's. __________________ The most-hated young engineer in America. * AVR Projects * Robot War: TI * About

22nd March 2006, 03:32 PM	(permalink)
hyedenny	Hi You can do it with a pic (or basic stamp) and a transmitter chip from LINX which has a range of over 3000ft. Your TOTAL parts count is 6 for the whole thing. And the cost, if you use the pic, will be less than 15 dollars. http://www.linxtechnologies.com/

22nd March 2006, 04:11 PM	(permalink)
hyedenny	OR...... you could use an rfPIC (like the rfPIC12f675) which is a microcontroller and a transmitter all in one! Ive never used one, but I want to soon!

22nd March 2006, 08:45 PM	(permalink)
DigiTan	Yes, I have the AVR equivalent of those chips-- the AT86RF401. But I don't think these modules are really advancing my understanding of RF circuit engineering. I'd prefer to do it with discretes if possible first--like audio's RF voice transmitters. __________________ The most-hated young engineer in America. * AVR Projects * Robot War: TI * About

24th March 2006, 04:55 PM	(permalink)
DigiTan	If it's on the AM broadcast band, longwave (within only 160 to 190 kHz), or CB band (within 26.96 to 27.28 MHz we're allowed 100mW from the FCC part 15 rules. So how about it? Can you guys help me out? __________________ The most-hated young engineer in America. * AVR Projects * Robot War: TI * About

28th March 2006, 01:23 AM	(permalink)
DigiTan	I take it from the 3-day silence no one can help. [edit] If it helps, I'm just curious about: 1. Will the posted design work? At all? 2. If not, what's okay and what isn't? 3. Shouldn't the transmitter/reciever be isolated somehow? Like with a duplexer? __________________ The most-hated young engineer in America. * AVR Projects * Robot War: TI * About

29th March 2006, 04:35 AM	(permalink)
DigiTan	Why won't anybody help me? :cry: __________________ The most-hated young engineer in America. * AVR Projects * Robot War: TI * About