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Subject: Re: Circuit Design Question for RF Remote
X-Newsreader: Microsoft Outlook Express 6.00.2800.1123
Date: Mon, 06 Jan 2003 12:40:20 GMT
NNTP-Posting-Date: Mon, 06 Jan 2003 23:40:20 EST
Organization: BigPond Internet Services (http://www.bigpond.net.au)
"skips" wrote in message
> It's been 17 years since I took circuit analysis in school and I have
> what I hope is a simple design question. Any help is greatly
> appreciated. I am trying to remotely light some LED's powered by a 3
> volt battery. Using a transistor as a switch - when the transister
> receives a small control signal - it completes the basic circuit and
> lights the LED's. The transistor receives it's control signal from a
> small R/F receiver (an RXM-433). My question is in this area.I would
> like to power the "receiver-on" circuit with the same battery that
> will power the LED's. In other words, the 3-volt always-on circuit to
> the R/F receiver will send a control signal (when a transmit is
> received) to the transistor acting as a switch for a simple circuit
> that uses the same 3 volt power supply. I hope I'm making sense here.
> I have posted a diagram of this circuit and this site,
> (http://www.pan-view.com/led/circuit.jpg). I would appreciate it if
> someone could look at this and tell me what's wrong or right with it.
> Or perhaps provide another alternative? Thanks for your help.
Do you mean the Radiometrix RXM-433?
If so, there may be a couple of other issues..
5V regulated supply, not 3V.
Carrier Detect pin (11) is active low.
Using only CD is ok if you don't mind false triggering from other
transmitters or interference.
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