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AM Transmitter Circuit

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gccradioscience

Joined: 18 Sep 2007
Posts: 1

Posted: Tue Sep 18, 2007 6:41 pm Subject: AM Transmitter Circuit

Hi, I need some more information on where do I find a cross reference for a BC109C NPN transistor. What I have with my breadboard kit is a NPN transistor 2SC1740 and the required parts and also a condenser microphone for this circuit. Also it says 9 volt, but what is the actual current requirement for this circuit to operate? Does it call for a 9 volt battery or does it require 6 AA batteries which adds up to 300 mA or does it require 6 AAA batteries which means 200 mA, or does it require 6 D batteries which is 800 mA of current. I tried to build this circuit, but it does not work right. I am checking my wiring connections for this circuit and transistor pin out. http://www.zen22142.zen.co.uk/Circuits/rf/amtx.htm or http://www.circuitdb.com/show.php?cid=159 Can someone help me out with this circuit, I would really appreciate it, thanks. Adam E. Virginia Beach VA <edit by Jospfh: Added an extra link>

Jospfh
Site Admin

Joined: 05 Jan 2006
Posts: 69
Location: Rosmalen, Netherlands

Posted: Tue Sep 18, 2007 8:28 pm Subject:

From http://www.anatekcorp.com/faq/archcomp.htm

Quote:

QUESTION NO. P42-3: I need a source for IC.CA3130T, BC109, BC109c,BC108, IC. BRY39, NEV555V, and MC336OP.
Most of the parts have ecg subs ca3130t=ecg930; bc109=ecg123a; bc109c=ecg199; bc108=ecg123a; bry39=no sub; nev555v is this ne555v=ecg955m; mc3360p=no sub.
NTE 239 (www.nteinc.com) is equivalent to Philips' BRY39, a silicon-controlled switch (not an IC), or else try Amazon Electronics (www.electronics123.com) for BRY39. Newark Electronics (www.newark.com) is listing both CA3130T and CA3130AT.

So an ECG199 would do as well.

As for the power supply I suggest you get you hand on a wallplug adaptor or something. Or your could built something like the 5V power supply with an LM7809 instead. Just be sure that it is enough to get the circuit working (I think 500mA should do) and then measure the actual current to decide wich batteries to use.
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