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NE612/602

Sun, 11/22/2009 - 23:08 — malti

An NE612 is normally configured as a mixer/oscillator for a DC rx. But watch what will happen if input pin 1 is earthed via a 10 K resistor. The local oscillator will appear at output pins  4 & 5.

So the same chip can act as both as an RX converter and as a TX vfo to drive a buffer to a pa !

An idea for a very simple qrp transciever.

Schematic: 

Comments

Thu, 08/05/2010 - 03:03 — wxl525504801

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Tue, 07/20/2010 - 08:56 — Xavi

food for thought

I'm designing a HF transceiver and I'm going to use SA612/NE612 as a product detector. used to listen to some pretty useful tutorials found by mp3 search but still I'm not sure what is the optimal signal level, which should be delivered to the inputs from the IF amplifier to achieve the best performance?

Sat, 08/28/2010 - 09:31 — lijun1174162718

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