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A little mention
22 December 2014 | by 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..
Steve, G1KQH, is a regular contributor to AmateurRadio.com and writes from England. Contact him at [email protected].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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