Magnum on steroids!

[MARKORAM94]

link ?

schema correct, pcb correct, no smt only tmt. post all here rusian forum. thanks. lobofoma best gold seeds nugets roma sexterous. anderwater also best.

you have here corect pcb and sch my problem was fixed, my friend orbit found litle problem and fix them
he testing them and work like golden mask
Thanks Orbit

[pustareka]

you have here corect pcb and sch my problem was fixed, my friend orbit found litle problem and fix them
he testing them and work like golden mask
Thanks Orbit

Thank youMARKORAM94

[pustareka]

I devices operate on 3 frequency: 8 (5) -12 (10) -18kGts.

Sent pcb serbia?
prise is 1 pcb ?
prise is all kit componant plus pcb ?

[pustareka]

sxema ok work -not work



bad very bad 4053 bad choise IC. not good 2500 kom resistance work bad- need 175 om at 15v
https://assets.nexperia.com/document...t/HEF4053B.pdf

best BUY adg444 15v 70 om resistance work super good.
http://pdf.datasheetcatalog.com/data...897adg441_.pdf

[pustareka]

Q1 is what ?

bad sxema ?

paralel 2 adg444 super senzitive good signal best depth and coins cash in hand. resistance 35 om. super good work 15v.

lm324 bad very bad ic u1c u1d dont put. need ICL7650 CHOPER IC x 2IC. Super ic work. Choper boot depth 30% garante.
ICL7650/53 are Improved Second Sources toICL7650B/53B♦ Lower Supply Current: 2mA♦ Low Offset Voltage: 1µV♦ No Offset Voltage Trimming Needed♦ High-Gain CMRR and PSRR: 120dB min♦ Lower Offset Drift with Time and Temperature♦ Extended Common-Mode Voltage Range♦ Low DC Input Bias Current: 10pA♦ Monolithic, Low-Power CMOS Design https://datasheets.maximintegrated.c...0-ICL7650B.pdf

magnum best work 15v power no no 5v. power 18v , stabilizer 15v. dekupled low broom. lm317.

[Artyom]

Q1 is what ?

bad sxema ?

paralel 2 adg444 super senzitive good signal best depth and coins cash in hand. resistance 35 om. super good work 15v.

lm324 bad very bad ic u1c u1d dont put. need ICL7650 CHOPER IC x 2IC. Super ic work. Choper boot depth 30% garante.
ICL7650/53 are Improved Second Sources toICL7650B/53B♦ Lower Supply Current: 2mA♦ Low Offset Voltage: 1µV♦ No Offset Voltage Trimming Needed♦ High-Gain CMRR and PSRR: 120dB min♦ Lower Offset Drift with Time and Temperature♦ Extended Common-Mode Voltage Range♦ Low DC Input Bias Current: 10pA♦ Monolithic, Low-Power CMOS Design https://datasheets.maximintegrated.c...0-ICL7650B.pdf

magnum best work 15v power no no 5v. power 18v , stabilizer 15v. dekupled low broom. lm317.

All this is your assumption ... Draw and share a scheme that will work better.

[pustareka]

All this is your assumption ... Draw and share a scheme that will work better.

read factory data.noassumption no fantazy no fake.factory sxeme work ok. trak signal highway. you see and mesure. no kill signal big resistance. need 15v no 5 or 3 or 1. test protobord work.

[vlambers]

Decided to slightly reduce the size of the device, it turned out 2x frequency (the place for the capacitors on the board 18 - 8 (or what we want), the board under the gainta g1910, now on / off, tone and frequency - "buttons", the choice of frequencies is implemented via relays (like on 5 mask), the indication of operating modes is introduced, the microcircuit 4041 has been removed, capacitors have a choice of ceramics or film ...

[Gwil]

Why is the 'on' resistance of the 4053 important? There's another 100k in series with each output, which is many times larger.

Also, I can see why a lower noise op amp would be better than an LM324 but its offset voltage doesn't seem to be very important (unless it's seriously unstable).

[Toros]

best BUY adg444 15v 70 om resistance work super good.
http://pdf.datasheetcatalog.com/data...897adg441_.pdf

If we are guided by your logic, the DG444 is an even better option because there is low on-resistance = 50 Ω

[Koala]

Decided to slightly reduce the size of the device, it turned out 2x frequency (the place for the capacitors on the board 18 - 8 (or what we want), the board under the gainta g1910, now on / off, tone and frequency - "buttons", the choice of frequencies is implemented via relays (like on 5 mask), the indication of operating modes is introduced, the microcircuit 4041 has been removed, capacitors have a choice of ceramics or film ...

Wow. That's really small and neat enclosure.

Looks really good.

Wait to here how it preforms.

[Hyena]

Decided to slightly reduce the size of the device, it turned out 2x frequency (the place for the capacitors on the board 18 - 8 (or what we want), the board under the gainta g1910, now on / off, tone and frequency - "buttons", the choice of frequencies is implemented via relays (like on 5 mask), the indication of operating modes is introduced, the microcircuit 4041 has been removed, capacitors have a choice of ceramics or film ...

Schema? If not, all your posts should be in buy-sell-trade...

[Hyena]

In Ukraine, so do business. Take someone else's name, rename it and give it away for one's own. Free customs, now European)))

And this is exactly the reason why I will never buy anything from Polland, even when you are our neighbors

[Davor]

Why is the 'on' resistance of the 4053 important?

It is not, but charge injection is. It is a phenomenon where a short current spike is injected into a signal path, ergo charge injection, due to the digital nature of switching circuitry. In CMOS switches the charge injection is greatly reduced in comparison to simple FET switches by virtue of using complementary mosfets, so a positive charge injection is cancelled by a negative injection of a complementary transistor doing the same thing. However, due to the asymmetry of P and N type mosfets, the charge injection is not perfect, and it is different for various offsets of input signal. Some switches are better than the others, and some may be improved by playing with offset.
In this particular case I don't believe there is a real problem with switches. They are running in a cyclostationary switching mode, followed by a 16Hz LPF, so charge injections can't do much damage, and the only effect could be a slight offset. Nothing else.

[Davor]

BTW, LM324 are not much of the opamps in regard to noise, but especially distortion. In the front end of a VLF detector you should use only low distortion devices, because otherwise you are promoting mixing of the air signal with target responses, and it results in great deal of masking.
A trick with 2k2 pull-down resistors in LM324 outputs may help fix its nasty crossover distortion, but it goes only so far. They should be avoided there. TL07x family is enormously better.