02-11-2020, 10:37 AM
Hi
The TA7642 is a newer version of the ZN414. There are some interesting ways of improving the output anbd and changing AGC response.
On one site one person has connected the output back to the aerial coil to add reaction, I cannot see how this can work as pin three is supply, AGC and detected audio which is decoupled by a 0.1uf cap so there should be no RF on pin 3 to feedback. I though only want to use the chip as an IF amp which allegedly works very well indeed.
The TA7642 is a newer version of the ZN414. There are some interesting ways of improving the output anbd and changing AGC response.
On one site one person has connected the output back to the aerial coil to add reaction, I cannot see how this can work as pin three is supply, AGC and detected audio which is decoupled by a 0.1uf cap so there should be no RF on pin 3 to feedback. I though only want to use the chip as an IF amp which allegedly works very well indeed.
