27 lines
1.2 KiB
Plaintext
27 lines
1.2 KiB
Plaintext
MS6S.1
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4. Locate the orange wire running from the center pin of the external power
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jack (with diode installed) to the power switch. Cut this wire where it
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passes the new regulator, and solder the end from the power jack to the
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INPUT terminal of the regulator.
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5. Install a diode (1N4003 or higher) on the OUTPUT terminal of the new
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regulator, anode toward the regulator (arrow pointing away from regulator,
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in other words). Now attach the other end of the orange wire (going to the
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power switch) to the cathode of the new diode.
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6. Nothing need be attached to the GROUND pin of the regulator if the
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heatsink is grounded well. If in doubt, add a wire from the GROUND pin
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of the regulator to the spot where the OPTION resitor was grounded to
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the transformer can.
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How it works... The old diode on the center pin of the power jack protects
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against accidental application of reverse polarity. The incoming 12v goes to
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the regulator and is dropped to 10v. The new diode drops the 10v down to
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9.3 volts (ideal for the radio), AND blocks drainage of the internal batteries
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by the new regulator.
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Steve Johnston, WD8DAS @ WD4MIZ
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September, 1990
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