simpson: Varistor silicon |
Meyer Rochwerger
 Schem.: 320 Pict.: 1802 20.Apr.17 13:16 Count of Thanks: 7 |
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Dear friends, I am restoring a VOM Simpson 260 series 6. Attachments:
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Nikolaus Löwe
 Schem.: 154 Pict.: 1065 21.Apr.17 11:04 Count of Thanks: 5 |
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The varistor seems to be a protective device for the meter. Try two standard silicon diodes (like 1N4001) in anti-parallel, that should do the trick. I presume the voltage required across the meter for a full reading is below 0.5V. Nikolaus Löwe |
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Meyer Rochwerger
Schem.: 320 Pict.: 1802 21.Apr.17 13:18 Count of Thanks: 6 |
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Yes, I know that the varistor is a protective device for the microammeter, and also thought of employing two silicon diodes to replace it. But ... I'm trying to get the varistor in order to preserve the originality of the meter. Thank you for suggesting. Meyer |
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Nikolaos Lamprakis
Schem.: Pict.: 21 20.Jul.21 20:31 Count of Thanks: 1 |
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Hallo. I have the same problem and im looking for "V1 varistor silicon 1 110670" is any one find something? |
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Steffen Thies
Editor
A Articles: 241
Schem.: 5 Pict.: 20 21.Jul.21 22:06 Count of Thanks: 1 |
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As is to be seen in the schematic, the varistor really is not a varistor, but two antiparallel diodes. This was widely used e. g. in landline phones, being selenium rectifiers in the earlier days. But "silicon" says it all - two standard diodes will do the trick here. Steffen |
