Minipulse JFet explanation needed.

[6666]

There are many newer, better analog switches available in quad, dual and even singles. However, most if not all are surface mount only.

The 4051 and 4053 chips are dips is there a problem using them ?

[Carl-NC]

The 4051 and 4053 chips are dips is there a problem using them ?

The 4053 is the most common demod switch used in VLF designs. If you get the HCT variety they can be directly driven from a 3V micro.

[waltr]

The 4051 and 4053 chips are dips is there a problem using them ?

No problem using them. My statement is about NEWER better analog switches.
These are still 4000 series although there are newer ones like the HCT version as Carl suggests.

I think the full pn is 74HCT4053.

[Carl-NC]

My statement is about NEWER better analog switches.

For singles & duals I like the Vishay DG series. They are cheaper than the Analog Devices ADG series and most are 3V logic compatible. The DG family also has some high voltage (44V) switches which can be handy.
There are also TI's TS5A and TS12A family. And there are the 74XX1G and 74XX2G series that several companies make. And Maxim has their own series. I've pretty much all of these. In SMT layouts they make routing much easier than trying to use a 4066 or 4053. But for breadboard and thru-hole use I stick with the 4066/4053.

[6666]

For singles & duals I like the Vishay DG series. They are cheaper than the Analog Devices ADG series and most are 3V logic compatible. The DG family also has some high voltage (44V) switches which can be handy.
There are also TI's TS5A and TS12A family. And there are the 74XX1G and 74XX2G series that several companies make. And Maxim has their own series. I've pretty much all of these. In SMT layouts they make routing much easier than trying to use a 4066 or 4053. But for breadboard and thru-hole use I stick with the 4066/4053.

Been down the rabbit hole looking at the DG series, did not know about them thanks.

[asolone]

For singles & duals I like the Vishay DG series. They are cheaper than the Analog Devices ADG series and most are 3V logic compatible. The DG family also has some high voltage (44V) switches which can be handy.
There are also TI's TS5A and TS12A family. And there are the 74XX1G and 74XX2G series that several companies make. And Maxim has their own series. I've pretty much all of these. In SMT layouts they make routing much easier than trying to use a 4066 or 4053. But for breadboard and thru-hole use I stick with the 4066/4053.

can i modify the circuit by replacing the fet j113 with an analog switch type DG403? what advantages would I have?

[kt315]

nonsense. use BF245. and pls turn off your fantazy.