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I agree with Carl
Roger says he wants something simple for a child, if your child is say 0-6 years old , then perfect , just type in BFO in any search engine on the net and you will find the most simplest circuits possible that you can build with a handful of components most of which can be obtained out of a old scrap radio.
You lads have to bare in mind with a young child the detector head will spend half its life stuck in the air anyway because to them it is just a toy as found with my daughter in the early years.
Once there older and showing genuin interested then you can go for more complex circuit with discrimination etc
Talking BFO , reminds me of my first ever metal detector project back in early 70s whilst still at school, built it from Everyday electronics projects, think it was 1971, not chips just 4-5 transistors
would detect old copper penny at about 2-3"
Doesnt sound deep by todays standards but back then there was very few detectors around and did I ever coin it in , like christmas everyday whilst on holiday with my parents.
The coil made from scrap transformer was laid out on peg board held with string, connected to a old broom handle, housing just scrap wood cliped to the shaft.
Anyways all the best Roger and do please let us know how you get on.
If your wanting something better Practical Electronics did a very simple induction balance design that works suprisingly well which uses one TLO62 and three NE555P ICs, the downfall is been Induction balance you will need to build the coils to spec and they will need nulling correctly unlike BFO, which to do properly needs a scope.
I agree with Carl
Roger says he wants something simple for a child, if your child is say 0-6 years old , then perfect , just type in BFO in any search engine on the net and you will find the most simplest circuits possible that you can build with a handful of components most of which can be obtained out of a old scrap radio.
You lads have to bare in mind with a young child the detector head will spend half its life stuck in the air anyway because to them it is just a toy as found with my daughter in the early years.
Once there older and showing genuin interested then you can go for more complex circuit with discrimination etc
Talking BFO , reminds me of my first ever metal detector project back in early 70s whilst still at school, built it from Everyday electronics projects, think it was 1971, not chips just 4-5 transistors
would detect old copper penny at about 2-3"
Doesnt sound deep by todays standards but back then there was very few detectors around and did I ever coin it in , like christmas everyday whilst on holiday with my parents.
The coil made from scrap transformer was laid out on peg board held with string, connected to a old broom handle, housing just scrap wood cliped to the shaft.
Anyways all the best Roger and do please let us know how you get on.
If your wanting something better Practical Electronics did a very simple induction balance design that works suprisingly well which uses one TLO62 and three NE555P ICs, the downfall is been Induction balance you will need to build the coils to spec and they will need nulling correctly unlike BFO, which to do properly needs a scope.
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