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waltertransmitter [2018/11/03 02:59] (current)
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 +====== Auriel Transmitter ======
 +
 +This transmitter built by Walter Kr√§mbring uses an Auriel transmitter card. Walter skips the op-amp entirely in his design and uses a single transistor to amplify the audio signal. To be perfectly honest, I am not sure that I understand how this connection actually works. I have a suspicion that is is dependent on the characteristics of the USB sound card he is using, so I recommend some experimenting with this circuit before you commit it to soldering.  ​
 +
 +The Circuit diagram is like this:
 +
 +{{:​wktransmitter_sch.jpg|Scheme}}
 +
 +The transmitter device used is made by Auriel and called TX-SAW433/​s-Z. It is available from many suppliers, but Walter recommends [[http://​www.soselectronic.com/?​searchstring=TX-SAW433%2Fs-Z&​str=378|http://​www.soselectronic.com]],​ where the device costs 3.28 EUR.
 +
 +===== Pictures =====
 +
 +Here is a closeup of the radio device and a USB sound card on the same board:
 +
 +
 +{{:​wktrans1.jpg|Transmitter}}
 +
 +Walter has built in an USB sound card together with the transmitter,​ so the resulting device is a USB connected universal 433MHz transmitter. He uses the power from the USB-interface to drive the circuit. Here is the device with its enclosure. Note the connector of the antenna in the lid of the box.
 +
 +{{:​wktrans2.jpg|Transmitter}}
 +
  

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