redesign of tiny from pulsdetektor.de

[bion]

Tiny

ok ,now what is "SPULE " in R1.???

[bernte_one]

R3 is 10k or 1k????
thanks.

look in the partlist i think there is a error at r23 (missing 2)
so r23 10k and r3 1K

and r5 at q2 is not r5 it is r35 r5 is besides r6

some hints for those who dont speak german

[bion]

Tiny

R3 is 10k or 1k????
thanks.

[bernte_one]

hello tepco

thanks for your info
some are done already, and some will follow
older fotos from my pcb here
https://fotoalbum.web.de/ui/external...tmKtx5m2A45703

regards bernd

[Tepco]

hello all

i need help to redesign a pi detector layout.

is the german "tiny" from www.pulsdetektor.de

the design is from 2002 but is still a good beginner detector with a lot

of modifacation option.

im not 100 percent sure and able to do redesign.

but what i want is change Q1 MTP2P50E (PMos/500V) as replacemant
the layout should take a irf9640 plus two biderectional supressor diodes

another change could be to change U2 LF357 to another one, lf357 is out

of production and hard to get or very expensive.

i would be nice if someone could do a new layout
with new Q1 plus diodes

changing u2 is a task for later is hard to find a substitute.

regards bernd

[ATTACH]18484[/ATTACH]

I built this small detector some time ago, it works quite well. Don't try to find MTP (too high Rds) use IRF9640 instead, no suppressors needed. Also change-adjust R1 dumping resistor value, this one on schematic is way too high for any coil. Especially critical in this detector, because timing is synchronized whit RX signal (U7), any ringing will mess up detector operation completely. If you have problems whit audio, just replace CNY17 whit another one from different manufacturer(too high mfg. tolerances). This detector is nonmotion mode, so you can expect significant warm-up drift and threshold will change during operation, (temperature, battery voltage etc), good idea is to use 10turn helipot for threshold (R34). Quality parts are mandatory, metal film R, film caps etc. Otherwise not bad at all. Original PCB is nightmare, more jumpers than parts, i built mine on prototyping board. Try to find LF357, 2x356 will work too (356 is as fast as 5534, if you not use some very fast coi will be OK). Also, just to mention, stunt whit 4053 (U3) and grounding integrator stage between pulses (R13/14) is completely unnecessary.

[Davor]

"Me no likey" went on my behalf, and you are right, google translate can't translate cartoon English. Sorry.

I'll stick to posh English and RP in the future.

[kt315]

but i have some problems with russian language

it is not written in russian. i ask you people to write on international english, i do not understand if you write Me no likey. for an example.

[zomby]

Zomby - please make your posts in English.
Here are the Forum Rules ->
http://www.geotech1.com/forums/showthread.php?t=10526

Vibrant and strong Santa Valentines's Day. What I want to tell people the forum is to help them understand what it is about you I do not publish notice in English but I said that my English is not good andis thus you make it impossible to communicate my regret. I optitvam is to write a little about not embarrass people. but there google translator who profit az.I and I read some nonsense translated in my language but I try to understand what it is, let everyone show imagination and logic. Happy Holidays

Отмяна на редакциите

[bernte_one]

hello

question was for possible redesign
so that i could it made more modern

coil in video is a monoloop

has enough sens for small objects and for my task

but you are right there is also a dual field planar shaped coil for this unit
shown and also a dual field with a outer ring and and inner star with three spikes
so you get fields with higher and fields with lower em concentration

the tiny which is shown has only a little part of all possible mods

the pots are
volume/tune with on/off switch
fine threshold with with multiturn pot
pot for variable coil damping

other can be sampling delay and pulswidth
in this case some resistor are replaced by pots

for using a supressor diode parallel to coil i dont need to redesign right?
just to solder one between coil connector inside housing would be best solution?
(when using a irf... for q1)

regards bernd

[Davor]

But video also reveals a big delay in detection. Me no likey

[Qiaozhi]

видео http://www.youtube.com/watch?v=70wtA...ature=youtu.be отношение Бернд

Zomby - please make your posts in English.
Here are the Forum Rules ->
http://www.geotech1.com/forums/showthread.php?t=10526

[Geo]

The coil at video is not a dual-field coil. If you read at the site of pulsedetektor you will find the detail of the dual-field coil who is more sensitive to small objects

[zomby]

The coil is a dualfield so no problem with small objects

видео http://www.youtube.com/watch?v=70wtA...ature=youtu.be отношение Бернд

[Geo]

The coil is a dualfield so no problem with small objects

[zomby]

This probe is a 28 cm. If so may want more depth for small items is otherwise very good.