Surf PI Pro

[deathmatch]

Yes, certainly. It will be simple in case of scheme start without this resistor the metal detector to have smaller sensitivity. I assembled here such simple pulse metal detector.
In this simple scheme only threshold strengthening is adjusted. I achieved result of sensitivity in 23 centimeters but that took a subject at a bigger depth to us 2 ways are given: to increase energy of an impulse of a rating or to lift cascade strengthening. The first way demands bigger power consumption, - drag the automobile accumulator on the cart, and the second - doesn't demand a big expense.
I will notice one serious lack of the scheme: to the 3pin of the 555th timer it was necessary to attach one more transistor and already through it to give on a gate 9640. It is so possible to receive more cool impulses at first and I will fall down
____________________________________________
Itself now slowly I do Surf XX. I sealed condensers at first. I decided to check and here a surprise: polymeric condensers.
One was short-circuited, and two others changed capacities.
I feel it is necessary to find my boxes with palladium condensers from the disassembled soviet military equipment.

[sdesic]

Most of parts are now made in China... we all demand cheaper parts and we are getting it... guess where we have lost...
I was testing for capacity in between two PCBs...
made one and it was OK but I was not 100% it was good ... it was not working and I made this one.
First was toner transfer on t-shirt label paper - second one is usual glossy paper and toner transfer

[deathmatch]

sdesic, view voltage on pins 4093:10pin , 11pin, 3pin, 4pin. View voltage on icl7660

[deathmatch]

Not how made in China. That at first put a palladium or rhodium layer on fibreglass - it very thin and for an eye is imperceptible. Here it also can give us parasitic resistance there where copper is pickled. I in addition on already pickled sites clean the remains of rhodium \palladium the concentrated nitric acid after etching a bathtub with chloric iron.
In my case with condensers everything is simple: at work wrote off balance UPS, well not to vanish to radio components! ! !

[sdesic]

4093 pins 10,11,3,4 all -4,37V

7660 pin 5 -4,37 V
pin 7 5.05 V
pin 8 4.98 V
pin 1 0.0 V
pin 2 2.4 V
pin 3 0.0 V
pin 4 -2.17 V
pin 6 1.22 V

[deathmatch]

congratulations!!! You found one of the misoperation reasons. The matter is that the scheme works if tension differs from face value no more than 0,3 volts. At a voltage of 4,3 volts from out 7660 the scheme works incorrectly. There are two ways further: to **** to itself brains with replacement 7660. Probably from 6-10 chips to you will carry - I tell it by experience of other participants. For some reason best of all work 7660 in soic case.
But personally I against use 7660 as it has very low frequency of transformation of tension and this low frequency it will be necessary to adjust\syncronize to the frequency of the 555th timer. It is simpler and better to put 79l05

[sdesic]

Ordered few DIP 8 versions of 7660 ...
from China it is few weeks to month
Thailand 14 days ... we'll see

[deathmatch]

I can't give the emotions in English, - well isn't present there to equivalents of the Russian mat with a force of a three-stage hydrogen bomb...
Use 7660 is a manifestation of a clinical case a deliriya at developers. At us them would send at once to psychiatric hospital of a name of Kaschenko.
Present that a Normal food of the person-3 times a day. But you sit down on one meal a day which consists of tea and a roll, and thus you to borrow with a hard work. I think that you won't be able normally to work. Therefore it is much better to use 79l05 and much cheaper

[sdesic]

7660 was used in original White's detector, we are using it to be similar device, you can change your device as you want.
I just want to detector to work.

[kt315]

I can't give the emotions in English, - well isn't present there to equivalents of the Russian mat with a force of a three-stage hydrogen bomb...
Use 7660 is a manifestation of a clinical case a deliriya at developers. At us them would send at once to psychiatric hospital of a name of Kaschenko.
Present that a Normal food of the person-3 times a day. But you sit down on one meal a day which consists of tea and a roll, and thus you to borrow with a hard work. I think that you won't be able normally to work. Therefore it is much better to use 79l05 and much cheaper

7660 is the CONVERTER of negative voltage from POSITIVE source. 79L05 is NOT . 7905 is NOT able TO GET the negative voltage if there is NOT the negative power source.
please, learn the electronics!

[sdesic]

I am sorry to go of subject but I am looking for LCR meter and found this one
http://www.ebay.com/itm/360291217212

4 Inductance Measuring Ranges :20mH / 200mH / 2H / 20H, +/- 2.5%, + 5 digits

Is it good enough ?

[porkluvr]

Recommend that you don't get that one.

20mH is the lowest inductance scale on that meter so it will not do a very good job of measuring low inductance coils.

What would happen measuring a 234uH coil for example? On the 20mH range, you would read .023 (except that the accuracy "+5 digits" specifications degrades accuracy).

A similar meter (similar, meaning 3-1/2 digit display) with a 2mH range will give 10x the resolution, so that the same 234uH coil would read .234 (plus or minus the accuracy etc.).

[sdesic]

thank you porkluvr
I was not clear how accurate it must be... 5 more or less is much ...
will try to find 2mH or less

[sdesic]

I think this is OK

http://www.ebay.com/itm/270840165867
USB LC meter

Too good to be true ?

[Guzzi]

LCR meter

I think this is OK

http://www.ebay.com/itm/270840165867
USB LC meter

Too good to be true ?

http://www.ebay.com/itm/Professional...item20d0d3f670

I use this LCR meter.

regards

Leendert