Sandbanks

[Qiaozhi]

Regarding the missing resistor ... in the text it clearly states "Solder R30 across the jack".

[Qiaozhi]

I didn't understand yet how to improve the audio quality, where should I put the Capacitors? I don't see any info image.

Thanks, Stay cool.

See ya

Read the section entitled "Audio Changes" and look at Fig. 1. Both can be found on page 8 of the article.

[Janotaking]

ok I will, thanks.

[Janotaking]

So IC4 7091 is LM709?

Thanks a lot men, you've been a great help, I really appreciate it.

[Janotaking]

Hello guys, I've found some IC's xD but I have some questions, the IC3 -> MC14011CP1 they say that its crucial to be a type "A" but I don't know what is that type that I've buyed xD the one that I have is the ->HEF4011BP, and it says some more things above that ->L8A5R8 05; UnG08176. LOL
I couldn't find the transistor Tr1 -> BC2141 the men in the store said that BC560 its equivalent, its that true? And I can't find the Tr6-> E1761 there's some equivalent?
I can't find the IC4 -> 7091 there's something equivalent?
And I can't find the switch 4.7 lin. pot. with d.p. switch - 1VR2/S1 Can I use something else? The girl in the store said that she never saw any switcher above 100K xD
This is almost done.
Thanks a lot. See ya.

[Qiaozhi]

Hello guys, I've found some IC's xD but I have some questions, the IC3 -> MC14011CP1 they say that its crucial to be a type "A" but I don't know what is that type that I've buyed xD the one that I have is the ->HEF4011BP, and it says some more things above that ->L8A5R8 05; UnG08176. LOL
I couldn't find the transistor Tr1 -> BC2141 the men in the store said that BC560 its equivalent, its that true? And I can't find the Tr6-> E1761 there's some equivalent?
I can't find the IC4 -> 7091 there's something equivalent?
And I can't find the switch 4.7 lin. pot. with d.p. switch - 1VR2/S1 Can I use something else? The girl in the store said that she never saw any switcher above 100K xD
This is almost done.
Thanks a lot. See ya.

The HEF4011BP will not work in this circuit. As it says in the article: "It is essential that IC3 is an unbuffered “A” type, since the buffered “B” type will not work in this circuit.".
You will need to look for a CD4011UB, which is the unbuffered type. This is the same as the A type referred to in the article.

TR4 is a P-type JFET and TR6 is a N-type JFET. You can replace these with any general purpose JFET of the correct type (P or N).

The BC214 is a general purpose PNP transistor, so a BC560 could be used as an alternative.

[Janotaking]

The OPA237; OPA2237; OPA4237 are all equivalent to the LM7091? So I need to get the SO-8 single/dual that haves four legs xD Isn't it? And the TLE2021A is equivalent to the Tr6 -> E1761? ok.
I've got the HEF4011BP that is the buffered type, but I can still use it for the IC7 correct? The IC7 is a buffered one isn't it?
Now, the IC8 and the IC2 I've used a L7812CV for the IC8 its correct? And for the IC2 Ihave a L7805CV is that equivalent or the same as 79L051?

Ok guys, thanks for the big help, I finally gone make a metal detector I hope it works

Thanks a lot again. Stay cool, bye.

[Qiaozhi]

And for the IC2 Ihave a L7805CV is that equivalent or the same as 79L051?

No - these are not the same.
The 78L05 ia positive 5V regulator, and the 79L05 is negative 5V.

[homefire]

The transformer can be made!

Winding 2 or 3:1 would be all you need.

http://g4hup.com/DFS/Rewinding%20Tok...es%20Coils.pdf

I've built it from the CirKet Kit produce in the 80's .

[Morgan]

Sandbanks PI

No Serafin . You can leave IC3 out . ( if you can find the TOKO transformer lateron you can place IC3 ) . Kees

Hello

Is possible to adapt 1 meter diameter coil in the Sandbanks detector ?

Regards

[homefire]

Hello

Is possible to adapt 1 meter diameter coil in the Sandbanks detector ?

Regards

The Sandbanks is a cool little detector for sure.

Not the most sophisticated.

If you keep the Z and R the same I don't see why not.

[carolyny476]

Symon . If you are using a seperate battery , why not use that battery directly to get your secondary power supply as done by the Toko coil . I built the sandbanks as per schematic but did not place the IC infront of the Toko coil . All I did is disconnect the 78LO12 from the diode and put a battery inplace of it . ( + on the 78LO12 and the - on the OV ) . If you can find the Toko transformer later on you can put the IC back in and connect the diode to the 78LO12 again . As far as the coil goes , I never used a Faraday shield on my coil and never had any negative result by doing it this way . The Sandbanks is a nice PI Detector with a lot of possibilities . Kees

Thanks you for the reply.

__________________
watch free movies online

[Orbit]

Without transformer.

[Morgan]

Sandbanks PI

The OPA237; OPA2237; OPA4237 are all equivalent to the LM7091? So I need to get the SO-8 single/dual that haves four legs xD Isn't it? And the TLE2021A is equivalent to the Tr6 -> E1761? ok.
I've got the HEF4011BP that is the buffered type, but I can still use it for the IC7 correct? The IC7 is a buffered one isn't it?
Now, the IC8 and the IC2 I've used a L7812CV for the IC8 its correct? And for the IC2 Ihave a L7805CV is that equivalent or the same as 79L051?

Ok guys, thanks for the big help, I finally gone make a metal detector I hope it works

Thanks a lot again. Stay cool, bye.

Hi

You still make confusion with nr of units and values,you put nr of units mixed with component value...Ex. E 176 (1) one unit ,component reference is E 176,see in schematic,not in parts list becouse is wrong.
I have the same troubles...Start the project long time ago and now want to finish.

Regards

[Morgan]

Sandbanks PI

No - these are not the same.
The 78L05 ia positive 5V regulator, and the 79L05 is negative 5V.

Hello

I start the Sandbanks project many years ago ,now i want to finish. I have two questions for you.

IC 7 can be HEF 4011 BP or need to be the same as IC 3 (CD 4011 UB) ?

TR6, reference E 176 can be replaced by 2N2646 ?

Thanks