Monday, 22 December 2014

A little mention

Christmas reading time, Sprat 161 popped through the letterbox in this mornings post. I see Graham (G3MFJ) gave me a little mention about the TDA2003's that I recently had come across, he had decided to grab a batch for G-QRP members sales:   http://www.gqrp.com/sales.htm

What interests me about this chip, as well as being a high powered 10W audio Amp, plenty of circuits which are available on the web. The TDA2003 has also been used in VLF PA design Amateur projects. From G3XBM: https://sites.google.com/site/g3xbmqrp3/vlf/8-97khz-earth-mode-transmitter

Also at 73KHz The Heyphone John Hey (G3TDZ):

http://bcra.org.uk/creg/heyphone/
 http://bcra.org.uk/creg/heyphone/pdf/heyphone-schematic-tx.pdf
 
I emailed John recently about the TDA2003 and  he reckons that they will work at 137KHz depending on manufacture? Time to get testing a few on the end of a signal generator..





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