HP-35 Power Supply Waveforms
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04-03-2019, 12:12 AM
Post: #10
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RE: HP-35 Power Supply Waveforms
I noticed in your other thread that the image of the 65's power supply is cut off on the left side. Just to make sure, you have a connection between Vss at the junction of C7/CR5 and CR4? If that is missing, the voltage regulation of Vss and Vgg would not work. CR 4 is connected in the correct orientation? What is the voltage across it while the supply is running (oscilloscope)?
As for checking the windings of T1, the number of turns for the L2 and L3 windings will be the same (as will their DC resistance). L1 will have more turns and the DC resistance will be a bit higher than for L2/L3. From your picture with the green perfboard, L2/L3 are green and red, L1 is the coppery colored winding. |
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