Ultimately when you break things down a receiver is not all that complicated. Sure in its entirety it can range from ultra simple to overly complex, but fundamentally they all share the exact same building blocks, switches, attenuators, amplifiers, mixers, filters and oscillators.
Within each of these individual building blocks there are many different variations of circuit topology that can be used. For sometime I have been thinking of writing a series of posts looking at each of these fundamental building blocks in some detail and offer some typical circuit typologies that are often used in homebrew receivers.
The image above is a block diagram of the receiver that I have been building for what seems like forever. What I will probably do with each building block is take a look firstly at different typologies and then at the specific topology I used, why i used it and will more than likely add in LT Spice simulations as well just for good measure. Being able to test and compare different circuit typologies without murdering parts is certainly a good skill to have.
So I will approach things in this order, Filters, Mixers, Amplifiers, Oscillators and then a quick look at switches and attenuators.