I would try to reduce R6 to a value from 5k1 to 9k1.
Quote:Why a divider for a base?
PiotrPitucha wrote:As for the divider, one resistor instead of R5 (2M) should be reduced to a 22k resistor, and the second resistor from the T3 base to ground, with the power supply also of 22k.
PiotrPitucha wrote:If the first stage provides the correct polarity at 100K, then instead of the unfortunate 10K I would give 100K or even more
PiotrPitucha wrote:There were "zero voltage drop diodes" on Aliexpress,
Quote:In recent years crystal radio hobbyists discovered that some "zero-voltage-threshold" MOSFET such as ALD110800 or ALD110900 can substitute the diodes in crystal radio without using a battery. You only need to add an extra coil between the source and the ground to pick up sufficient current induced from the resonant circuit (aka the tank or the LC circuit) to drive the headphone.
However, ALD110900 or ALD110800 are quite fragile and can be easily damaged by static electricity or extra strong signals. They are mostly used in weak signal detection only. The output volume is also a bit low.
PiotrPitucha wrote:The second method of making a perfect detector is simple, we take an op-amp and make a perfect rectifier on it