Re: TI-H: RF Link Idea....
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Try this:
Red wire, and the White wire are connected to the positive (+) of the speaker
and the mic, and the ground is connected to the (-) of them.
-Lee
At 06:39 AM 11/2/96 +0000, you wrote:
>So you're sayind i'd need a modem of sort, then connect that to an RF
>transmitter/receiver? Uhg, that's lots of work. I wanted to use a walkie
>talkie, and it uses a mic, which converts sound into electrical pulses. Why
>wouldn't the electrical binary code from the calc simply represent a sound
>wave? A mic pics up sound, then converts it into electricity, then sends it
>over RF. Why can't plugging the send cable into the mic spot just work? I
>get what you're saying about it needing binary, but like you said, its +5v,
>0v. On, off. Why doesn't that end up being represented as a sound wave?
>
>Binary: Analog:
>__|__||_|| _/\__/\/\_/\/\
>
>It should work! I don't get why it cant!
> /--------------------------------\
> / Travis Pettijohn \
> / primary: travisp@inil.com \
> / alternate: travisp@juno.com \
> / http://www.inil.com/users/travisp/ \
>/------------------------------------------\
>
>----------
>> From: Greg Hill <ghill@lab.tech.bhs.davis.k12.ut.us>
>> To: ti-hardware@lists.ticalc.org
>> Subject: Re: TI-H: RF Link Idea....
>> Date: Saturday, November 02, 1996 12:44 AM
>>
>> travisp wrote:
>> >
>> > TTL?
>>
>> Yeah. It's a TLA (three-letter acronym). It means transistor-transistor
>> logic. It's how computers work. The logic signals (high and low)
>> correspond to voltages, typically +5v and 0v. Those are the digital
>> signals that get piped around computers, representing whatever
>> information you're processing. TTL basically says that a HIGH signal
>> equals +5v and a LOW signal equals 0v (or *very* close to it). You'd
>> need a chip (modulator) that converts this digital signal into an analog
>> (sound) signal for transmission over the radio, and then a demodulator
>> chip to convert the analog/sound signal back into TTL logic signals.
>> Whew!
>>
>> --
>> Greg Hill
>> http://braves.bhs.davis.k12.ut.us/
>> ghill@lab.tech.bhs.davis.k12.ut.us
>> greg_hill@email.state.ut.us
>
References: