Hi Jeff-
family issues and life stuff managed to derail ALL of my projects ( the 422 pwr sply, the 475 ps with issues, other radio projects ), however I did manage to get the supply working without a load (, hey this thing works down to 6V input!!! output Voltages are high but as expected!.) I know not recommended, under the load of the scope I noticed that it has issues too! so I have to find the faults in the scope before moving fwd.
the waveforms in the pwr sply look close to the ones in the book. I did notice that with something drawing too much current on the output it is exhibiting a similar issue as yours. Q1184 gets noticeably warmer than Q1174 as the input V increases. ( I also rises....yep, go figure, normal). I want to know why!
I will post my method and results at a later time. John's repair ( with the MJE1660) made me go back to my original premise that those transistors really do not matter and good old 2N3055/2n5881/2n5882 work just fine. just mounting issues with the TO-3 case. (currently they are mounted to an external heat sink)
I will go into monitor mode for a while longer.
Tnx for the assistance. It has been appreciated.
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On 2018-05-28 09:01 AM, Jeff Urban wrote:
It is going on the back burner. I am going to put it together for its own safety. I am out of ideas and last I looked so was everyone, so I might just use it as a 12 volts scope or something...
If anyone gets any ideas I am all ears. For now I got bigger fish to fry, which ummm, by the way...
Yup, those 7000 series are next. Coming soon.
