The circuit now looks like this:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBINlvR1e8gWrr3Y3K617W5IXcrrl1F8p2kRvcdWehcLswxAbnF1kE3CEvElbNjRRwcTrp6mE9I57W_d5cYJUeCR-wWpA-Qk0ZmJKJ7s8AI4poXG8R6IuagMP7Me73sr8QlIcaa9FAj8pl/s320/2013-01-31+22.46.09.jpg)
The two outputs show the mixed down frequencies when the local oscillator is tuned to its two extremes.
The lowest frequency is about 13kHz, which is probably a bit high. But let's wait until we can listen to the signal until we fine tune it some more.
The next step will be to define a push/pull amplifier for the loudspeaker. By the way, a loudspeaker might draw a bit to much power, so I'll see if I can use a summer from a PC motherboard instead. I'll need to measure its impedance first, to make the calculations for the amplifier.
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