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    Power supply can't get zero volts

    Thank you all for your advise. Special thanks to AnalogKid, your first note was really helpful. The datasheets I'm using do not have any graphs (TI and Nat Semi), but they do imply what you noted with the "Output Voltage Swing" parameter specification. I just didn't understand that point but...
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    Power supply can't get zero volts

    Hi All, thanks for reading my post. I had an old HO train transformer (power supply), that had failed. I decided to modernize the circuit components to make it safer, and more reliable. I used a solderless breadboard to make the circuit below. As designed, the operator would use the 10k Ω...
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