easy build nice metal detector ..

  Pay mind that we do not use Russian Transistor Designations or Part Numbers.

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http://www.thunting.com/smf/index.php/topic,59939.msg293513.html#msg293513

The part numbers look OK to me, Homefire.

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http://www.thunting.com/smf/index.php/topic,59939.msg293516.html#msg293516

USE : 100nF capacitors must ( 63 V ) need to take film, that such voltage take as little as possible

USE :  R7-R8 with 2 watt  for 074 version ( if you want use stone resistors )..

To search coil winding need copper wire diameter 0,5-0,7mm ..If there is no, you can use another. the same copper lacquered wire was not enough. Took an old power cord i used picture at the bottom.

23cm (25 turns), 15cm (17 turns) and 10 cm (13-15 turns).

Tests conducted on the average lady coil diameter of 15 cm. So the gold ring on the air caught the 18cm, 30cm scissors. table lamp 50cm. that is not bad enough for that of metal detector. and youll see 23cm diameter will give nice results..  

metal detectors coils have some rules ( high diameters go more the deeper but most difficulty seeing fine detail. Small coil clearly see fine detail, but the depth is not great. )

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http://www.thunting.com/smf/index.php/topic,59939.msg293553.html#msg293553

ill check your other metal detector schema bernte_one..

i added part list for all 3 versions all in one dont need all parts at the part lists look schema for 074 you dont need E157 etc....... look your schema and youll find whats that..

and when you see russion resistor thats little info for that  

we need to evaluate what the maximum power the resistor can dissipate. From top to bottom, the bottom of the photo resistors on the power: 2 Watt, 1 Watt, 0.5 watts, 0.25 watts 0.125 watts. On the power resistors 1 and 2 watts write MLT-1 MLT-2, respectively. MLT - a kind of the most popular Soviet resistors of abbreviations etallichesky M, L akirovanny T eploustoychivy. Others have power resistors can estimate in size. The more resistance in size, the more power it can dissipate into the surrounding space. Joule-Lenz has not been canceled.

Units of measurement in MLTeshkah - Oma - referred to as R or E. kiloomah - letter "K", megohms letter "M". It's simple. For example, 33E (33 Ohms); 33R (33 Ohm); 47K (47 K); 510K (510 kW); 1.0m (1 M). There is also a feature such that the letters can outpace the figures, for example, K47 means that the resistance is 470 ohms, M56 - 560 kilos. And sometimes, not to zamarachivatsya with commas stupidly pushed back bukovku, for example. 4K3 = 4.3 kiloomah, 1M2 - 1.2 megohm. Let's look at our hero. Look directly at the designation. 1K0 or the word "ka one zero." Hence, the resistance Dolno be 1.0 kilos.

FOR coil:

The coil is wound on the rim 20cm lacquered wire SEW 0.40-0,60
from the coil to the board, the thicker the wire the better sensitivity, the wire should be stranded copper compound without any twists should be soldered, iznochalno do without plug solder wires from the coil directly on the track, as you can earn to experiment with a variety of connectors, from all this will depend on the range adjusting the sensitivity and stability

It is necessary to track zaludit before pick up coils of the coil increases the sensitivity up to 3 cm, this will depend on how the quality were etched track coil 25 to 10 turns, if not lacquered wire that goes even solid copper wire in plastic insulation diameter of 0.40 - 0.60 remove insulation is not necessary, wound 25 turns and test unrolling one branch cutting their sensitivity begins to grow and how to feel that the sensitivity starts to fall count the number of turns and wound adding 1-2 new coil and the coil is ready..

this one is standart ( 25 turns of wire with a diameter of 0.5 mm wound on a mandrel diameter 18cm )

The coil should buzz

I have reached the maximum sensitivity
10 turns in the coil 2 ohms
wire thickness 0.45
coil diameter 20 cm
R7 75th,
from the coil to the board stranded copper wire 1.5 square below the thicker the better.

Coil shakes (in the embroidery frame) is not about expensive entirely of plastic contains no metal objects, the inner ring and take out it shakes the coil put back twist and coil is ready, it is very convenient to pass through it in hand earth metal checking is there or not

At the request of R7 can not put a set place for a variable resistor on the 400th 1-2 watts less otherwise not burn, set to be set to maximum sensitivity, how to earn a better result unsolder and measure how much on it as th on and set Resistor R7

Coil should be tested by further from the board and other metallic objects, it is best to hang in the middle of the room for further from electrical appliances, then it will be more likely to be set to maximum sensitivity

MORE info which one is for what  
R2 is responsible for the duration of the pulses from 1k to 2,6k
from 25mA to 48ma it will depend on what is powered by a 9V to 12V
R3 is responsible for the frequency
R11 from 1 MOhm to 3 IOM
R16 from 470k up to 33K
C3 from 1mf to 4.7mF
C4, C6 from 10mf to 20mF
C1 from 100nf 220nf to change the purity of sound
C6 from 10mf 1mf to enhance sensitivity
R8 from 390th to 70th watt 0.5 sound will be louder
R7 from 390th to 50th 1 watt grow sensitivity
C8 ot1000 to 2200 clicks can be clearer to 4700 microfarads to during the pulse was not a failure

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http://www.thunting.com/smf/index.php/topic,59939.msg293575.html#msg293575

i looked the 074 layout file, is most ij smd very nice,  but where can i see a video of this unit working???

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http://www.thunting.com/smf/index.php/topic,59939.msg293593.html#msg293593

my machines at work http://mueller-meteoriten.de