Hi, all,
The input stages (particularly the divider, marked in RED box in the diagrams enclosed) of JLH1969 and JLH2000 is a bit different, but I don't know the exact difference between the two, especially the purpose of C1/R3 of JLH2000.
I am wondering that may be the introduce of C1/R3 in JLH2000 is related to an acurrate control of frequency range of the input filter? But I am not very clear on the idea or calculations for the values involved.
Btw, the schematics are taken from https://www.electro-tech-online.com/custompdfs/2009/09/jlh1969.pdf and https://www.electro-tech-online.com/custompdfs/2009/09/jlh2000.pdf respectively.
Sorry, "JLH1996" in the title should read "JHL1969", but it seems I am not able to edit it once posted.
Thanks for any hints,
/bruin
The input stages (particularly the divider, marked in RED box in the diagrams enclosed) of JLH1969 and JLH2000 is a bit different, but I don't know the exact difference between the two, especially the purpose of C1/R3 of JLH2000.
I am wondering that may be the introduce of C1/R3 in JLH2000 is related to an acurrate control of frequency range of the input filter? But I am not very clear on the idea or calculations for the values involved.
Btw, the schematics are taken from https://www.electro-tech-online.com/custompdfs/2009/09/jlh1969.pdf and https://www.electro-tech-online.com/custompdfs/2009/09/jlh2000.pdf respectively.
Sorry, "JLH1996" in the title should read "JHL1969", but it seems I am not able to edit it once posted.
Thanks for any hints,
/bruin
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