EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: sampler1 on August 19, 2021, 07:56:33 pm
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Hi All,
like many the Oscillator died in my Huntron 1005B. as you know they are no where to be found. I came across the old kit schematic and figured I would try and build one. My 1st problem was IC1 and IC2 as they are not identified in the original schematic. I was told by some members to try LM336.
At this point I have made the PCB but its a no go. I seem to be able to adjust the gain a bit but it seems to go into clipping very fast. The frequency does not adjust at all. So here I am bringing it to the pros. It should produce 80Hz at 10VPP.
Any suggestions or see any errors?
Best regards
(http://[attachimg=1])[attach=2][attachimg=2][attachimg=3]
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as I read the kit schematic, it seems to me that it is written 1/2 1458 beside the two aop ?
so it should be a LM1458, obsolete, or its actual equivalent MC1458 ?
and the LM336 is a voltage reference, not an AOP !
even the LM356 is a single AOP ...
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In your schematic, I see D4 backwards. Otherwise the circuit remake looks reasonable to me, assuming you are using 1458.
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as I read the kit schematic, it seems to me that it is written 1/2 1458 beside the two aop ?
so it should be a LM1458, obsolete, or its actual equivalent MC1458 ?
and the LM336 is a voltage reference, not an AOP !
even the LM356 is a single AOP ...
I have many LM1458's in stock and the Lm336 are for IC1 and Ic2
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In your schematic, I see D4 backwards. Otherwise the circuit remake looks reasonable to me, assuming you are using 1458.
OMG D4 is backwards.. Ill check that out tomorrow and report. Thanks!
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as I read the kit schematic, it seems to me that it is written 1/2 1458 beside the two aop ?
so it should be a LM1458, obsolete, or its actual equivalent MC1458 ?
and the LM336 is a voltage reference, not an AOP !
even the LM356 is a single AOP ...
I have many LM1458's in stock and the Lm336 are for IC1 and Ic2
oups should have read better !