chemelec
Well-Known Member
His Email address is on the lower left corner on his page.
Thanks jjw, Don't know how I Missed That.
Now I will Email him.
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His Email address is on the lower left corner on his page.
RCA invented ordinary 4xxx series Cmos logic. They show a linear amplifier made from a CD4069 inverter (an MM74C04 is the same). The current is very low especially with a 3V supply so a 10M feedback resistor is used. The graph here from RCA shows a gain of nearly 500 times with a frequency response to only 800Hz when it has a 1k input resistor.His Email address is on the lower left corner on his page.
Hi AudioGuru, I just sent him an Email.
Now waiting for his response.
I can't help feeling this mixer is getting to be way too sophisticated for such a simple task!...
I built a heterodyne bat detector about 10 years ago, and just used an 'off the shelf ' bog standard 4052 CMOS multiplexer as a switching mixer. Because the LO for a switching mixer is a square wave, only the 'signal' input - and its inverse - need to be linear. Much simpler !