Simple Intermediate Frequency amplifiers using obsolete integrated Circuits
Here are a couple of simple IF amplifiers using obsolete linear IC's.
They are not my circuits ( I think - the 3028/3053 might be ) but I have used them successfully and might save someone some research time hitting the books.
CA/LM 3028 and 3053 are basically the same chip, the '3028 version being good for much higher frequencies than the '3053, although both are completely suitable for HF frequencies. The '3053 in its day was the less expensive chip, although decades later that has reversed. Neither chip is especially common these days, but are still available. The '3028/3053 can probably be duplicated with discrete components, although I have not tried that. These are through hole parts only. A much higher gain amplifier can be made by using the third transistor, but the circuit here does pretty well gain wise, and is easily made stable.
Both '3028 and '3053…