redesign of tiny from pulsdetektor.de

[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.

[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.

[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

[bion]

Tiny

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

[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

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

[DOOLEY]

spule is coil in german.

[zomby]

this is everything you need to make a metal detector TINY
success of all

[zomby]

more here

[bion]

Tiny

i almost finish built Tiny MD ,now for the first start what should i do?

regards BION.

[bernte_one]

hello

connect coil and battery and switch on
turn the potentiometers so that you get a klicking sound
when you find that point then make fine adjust for example 1Hz click or so
the detectorneed some minutes to get the right working temperature
but check the components while testing so that they do not overheat
(maybe you damping resistor is not the best or coil has not the right resistance etc.)

regards

[bernte_one]

hello again bion

if you have trouble at first start please check q2 there are different type of it
maybe you have another type as shown on component overlay
it is better to look on shematic

i think you will do all right

here video from another builder of tiny http://www.youtube.com/watch?v=9H8obPIA_pM
regards

[$hooter]

question

hi guys
i'm looking for best pro for PI metal detector,what's the best kind of PI metal detector i'm really perplexing,i don't know what i choice to start my pro,what i want? i want metal detector that given a good depth for small items like a coin.etc i don't care about the discrimination because i don't search in areas that contain a trash, all area that i detect it is a clean area and have only coins and some time nugget...what u recommend me that the chosen to start my pro:
1- white surf PI.
2- delta Puls2
3- Puls Star-G2
4- tiny
5- other?
which one give me that what i'm looking about?

[Qiaozhi]

hi guys
i'm looking for best pro for PI metal detector,what's the best kind of PI metal detector i'm really perplexing,i don't know what i choice to start my pro,what i want? i want metal detector that given a good depth for small items like a coin.etc i don't care about the discrimination because i don't search in areas that contain a trash, all area that i detect it is a clean area and have only coins and some time nugget...what u recommend me that the chosen to start my pro:
1- white surf PI.
2- delta Puls2
3- Puls Star-G2
4- tiny
5- other?
which one give me that what i'm looking about?

If this is your first project, then I recommend you go for the Surf PI kit from Silverdog's shop ->
http://www.silverdog.co.uk/shop/inde...&product_id=76
The schematic and parts list can be found on the right-hand side of the page.
This is an inexpensive detector that is simple to build and setup, but with good results.
Plus it's a tried and tested design.

[$hooter]

Hi
thanks a lot, but u said it's an inexpensive and easy to build, i don't care about money and difficulty
the most important thing is the performance ,and i have anything related with surf PI(schematic,pcd..etc) but i don't know it's range depth in the ground about small target, and what's the optimal coil for this metal detector that given good depth for small object,is the dual-field coil good for this metal detector?,or there's other one better,plz write the specifications of search coil (if it dual-field or other),