My new homemade shortwave receiver with ECC81 / 12AT7 tubes
It is a simple shortwave receiver.
The original idea is from PE0RIG and I made some minor changes, I changed the coil-diameter to 22 mm by using a standard coupler tube from the DIY-shop.
The tuning capacitor is now 100 pF instead 47 pF so I can tune the receiver over a wider spectrum. The output transformer is a 220V-9V transformer.
The power supply is nothing special, just straightforward. I added an extra resistor of 100 kOhm to unload the capacitors when the receiver is in his off position.
The schematics are down here.
Link schematics Receiver : http://animals.home.xs4all.nl/files/1V2_Shortwave_receiver.jpg
Link schematics Power supply : http://animals.home.xs4all.nl/files/1V2_Power_Supply.jpg
Link PE0RIG on YouTube : http://www.youtube.com/user/Radiointeressegroep/videos?view=0
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