What is type Feritte core coil for LM1812?
Circuit is Depth Sounder

 

What is type Feritte core coil for LM1812?

Read about coil in PDF:

 

Looks like the capacitor is 0.001uF or 1nF.
Frequency 200khz.
The inductor should be 600uH.
While researching this I see that you can adjust the capacitor value. The point is to have the LC to resonate at 200khz. Some people were using " CAN-1A901HM " which has a different value, then changing the C to compensate.

Can you get the IC now days? I don't think so.

 

hi lok2
This is a PDF for the LM1812, showing coil winding formation,
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I think for L1 650μH is good. A similar Elektor circuit uses the same value. What worries me and I do not understand is L2.
Thanks for the replies

 

hi rx2,
Which circuit are you referring too regards L2.?
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Is it my PDF circuit.?

 

 

hi rx,
L2 is the transducer driver inductor, usually a step-up transformer.
L1 is the base oscillator inductor.
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Added: For L2 note the over wound inductor/auto transformer symbol

 

Τhank very much.

 

Can you get the IC now days? I don't think so. Yes they are still avalable on E bay, at a higher price than what i paid back in the 80s. Some Furuno sounders used this ic.

 

In my country they exist and they cost 30 euros each. High price. Certain ICs are also rare, as are the displays. The problem is still the ferrite core, because the ones described are very old and are no longer available on the market.
I am also studying the Elektor para circuit which gives some details about the coils.

https://archive.org/details/elektor-1984-06-v-162

 

hi rx,
I used RM7 or RM10 ferrite cores successfully in my echo sounder products.
How much power do you want to drive into the transducer, and what is its type.?
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https://www.google.com/search?q=RM1...ZEC0wQ_AUoAXoECAEQAw&biw=1163&bih=651&dpr=1.4

 

The circuit of Electronics Australia does not have a power-boosting transistor at the output like the Elektor. Maybe I'll add a transistor. As a converter I will use an old depth sounder that I have.

 

hi rx,
I used RM7 or RM10 ferrite cores successfully in my echo sounder products.
How much power do you want to drive into the transducer, and what is its type.?
E
https://www.google.com/search?q=RM1...ZEC0wQ_AUoAXoECAEQAw&biw=1163&bih=651&dpr=1.4
[/ΠΑΡΑΘΕΤΩ, ΑΝΑΦΟΡΑ]
,
,

RM10 I'm thinking of using for L6. Do you happen to know the number of turn for 200 KHZ?

 

hi rx,
My transducer driver is similar to the circuit you posted.
The TIP can also be a Darlington
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hi rx,
It would help if you identified on which circuit, the location of L6.
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γεια rx,
Θα βοηθούσε αν προσδιορίζατε σε ποιο κύκλωμα, τη θέση του L6.
μι
[/ΠΑΡΑΘΕΤΩ, ΑΝΑΦΟΡΑ]

 

L2 sorry no L6

 

hi
L2 is a step up auto transformer, 2 turns and 44 turns on a RM10 core.
Enamelled copper wire 0.8mm or 1mm OD diameter.

Read the LM1812 PDF I posted for details.
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Thanks you very much