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This circuit looks same as US Pat. No 4303879.
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This circuit looks same as US Pat. No 4303879. -
Re: Garret circuit
What is the purpose of pins 4,5,6,7 op-amp (LM?)393 , is it just that garrett have not used it and tied pins 6&7 together to keep device stable?
Is the machine an older (late 80's) model ?
Thanks for posting , I'm sure it will come in useful for many of us on this forum.
One last question , is the transformer for the receive coil in the loop or in the machine ? -
Re: Garret circuit
The ADS Master Hunter was first made around 1979 I think, and there was a series of them over the years, up to the ADS-7.
LM393 is a dual comparator, so pins 5/6/7 are the comp that is not used. 6&7 are tied just to keep it from flopping around.
Transformer most likely in the machine.
- CarlComment
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Re: Garret circuit
I found first error in the circuit - the audio generator can't work. It's better to get it from another place or to check patent origin!
Regards,
E.Comment
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