Anybody can recognize which model is this one?
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Originally posted by TH Jim View PostYes the 1220's VCO for audio discrimination is what appeals to me! Very easy to quickly decide whether to dig targets on a beach where junk and coins abound.
What are the errors on the schematic?
sorry for my English
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This may be of some help (or not) This is the inside of my 990-B which has audio disc( plus meter) --the main reason I like it so much--it "growls" at all iron targets.
http://174.132.129.189/~moreland/for...&postcount=147
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