XR71 Operation Help

hello
i was trying to find the STTH1210D diode.....my question is can i use BYT12P-1000 instead? Sorry meaby you have mentioned that somewherre but i guess i missed it....
Are therre any mods i should be aware of besides the actual complete project posted by Eugene? If any can you please point those to me ?
thanx
regards
Marius

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http://www.thunting.com/smf/index.php/topic,2887.msg76759.html#msg76759

If I can complete my DP, its performance is same whit economic one.

What make a circuit? Schematic, Circuit board and some electronic part. If tow circuit board have same schematic and same electronic component they should have same result.  In addition, one other viewpoint with my own experience demonstrates that something in kit format has weak performance than the completed one.  So DIY


dear steaua581

you can replace STTH1210D with BYW29 without any problem.



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http://www.thunting.com/smf/index.php/topic,2887.msg76907.html#msg76907

 Dear Hobbyist

As my knowledge if you find one circuit that sold in kit format (not only PCB), it is just for educational purpose because if you are not a beginner you construct your circuit yourself and do not waste your time(=money ) just for soldering a PCB. Soldering price for circuit like DP is very low in manufacturing line less than 0.5$.

If you buy a kit, you should assemble it and then tune it. It looks easy but it is not.
In assembling, you should know electronic parts, its values, passable polarity and finally good soldering.
If one is wrong all circuit in optimistic condition do not work.
Tuning is another problem. A good tuner should have one or both of these conditions:
1) Experiment:  it is valuable part of all works
2) Measurement instruments: they usually are expensive and you should know how use them.

Somebody says DP can detect a coin at last in 45 cm but I know one who achieve 65 cm with a little modified DP, a full normal construct DP in here cost 120 $ but this gay?s DP sold in 250 $.

Another example is stuart I, it is designed in 198? You can buy its kit and if you adjust it nice, you can reach at last a coin in 18 cm but my modified stuart I detect a coin in 28 cm. (but take 2 week)
In commercial ready detectors manufacturer try to final produces have maximum passable performance with minimum passable price but in a kit they usually try to final produces have easy as passable for assembling for user because of educational purpose then minimum passable price and at final acceptable performance.
If you do not have enough experience in electronic, especially in metal detectors do not waste your time and money for a kit Buy completed one.


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http://www.thunting.com/smf/index.php/topic,2887.msg76912.html#msg76912

Hi

My friends I captured this signals from pin 2 of LF357.those signal show that coil sense metal parts but in output of LF357 (pin 6), I could not find anything useful.
What is mean of these signals?
It is impassable that LF357 was ill because I changed all active components (transistor, IC and diode) of circuit.

Can anyone paste shape of DP?s LF357 output signal?

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http://www.thunting.com/smf/index.php/topic,2887.msg76953.html#msg76953

Yes, LF357 was warm a little! But why? 
I think warming of LF357 is not normal.
 I do not have another LF357 to replace, so is it passable for anyone who has ready DP test this problem?


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http://www.thunting.com/smf/index.php/topic,2887.msg77125.html#msg77125