KB6NU drew my attention to this article on using operational amplifiers in audio design. It’s apparently drawn from material in Douglas Self’s book Small Signal Audio Design. As someone whose really just become involved in the ins and outs of analog electronics, I find his pragmatic approach and explanations to be really helpful. Check it out.
Daily Archives: 6/6/2011
G0NQE’s Acorn SDR receiver kit
Ever on the lookout for software defined radio designs, I was pleased to see G0NQE’s simple receiver design this morning. He offers a kit, but also offers the bare PCB board, and puts the schematic and parts list on his website. Very cool. It’s pretty much a textbook Tayloe-style switching detector, which is implemented entirely with common through-hole type chips. It uses a crystal oscillator which can be switched between a 14.7456 Mhz and a 15.0Mhz crystal, for reception centered on 3.68 and 3.75 Mhz. It uses the 74HC4052 as the analog switch, driven in quadrature and feeding an NE5532 op amp to provide the I/Q signals.
Check it out: g0nqe-acorn,sdr,receiver,kit.