| The Shop > Electronics & IC Programing |
| Digital oscilloscope project/kit |
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| John Rudd:
Roy, when you say its not working, can you elaborate a little please? Is there any audio? Maybe theres no air traffic transmitting? :lol: |
| wheeltapper:
sorry, I was a bit vague :hammer: connecting the bnc socket to a long wire I have in the loft and touching the top of one of the chips with my finger I can barely hear a commercial radio station. the 3 controls do nothing. this is with a 9V battery, if I plug in a 12V wall wart the transistor mentioned previously gets hot even tho it's supposed to work on 12V. there are a few voltages noted on the circuit diagram that came with it , one of them being 12V but there aren't as many as I would like. I haven't had time to check them yet. Roy. |
| John Swift:
Hi Roy the original project is here - http://www.sentex.ca/~mec1995/circ/aviarx/aviarx.html with 1K load resistors I don't expect the transistors to run hot but the TO-92 cased 78L08 regulator added to the Chinese circuit could (depending the current taken by the receiver and the volt drop across the regulator) John PS original circuit from http://www.sentex.ca/~mec1995/circ/aviarx/aviarx.html |
| RobWilson:
:clap: :clap: :clap: Thank you for taking the time to track down that build page John :thumbup: I am sure it will be a great help to me and Roy . And the http://www.sentex.ca/~mec1995/circ/circuits.htm page looks full of interesting projects :zap: Rob |
| John Rudd:
The voltage regulator serves no real purpose, there's insufficient headroom from a PP3 battery to allow the reg to function.... I'd be inclined to leave it out.... Just use a current limited power supply when testing the receiver for the first time.... :zap: |
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