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This is a worth while addition to any power supply. What it does is to suppress any transients that might try to sneak in via the output terminals. Such as stray radio frequency commonly referred to as RFI or radio frequency interference. I add it to all power supplies that we build.
If you have ever seen a spark when connecting a radio, such as the Uniden ® 2510, then this will protect the power supply's regulator. I have had this situation destroy a 723 voltage regulator a few times before I learned what was causing it. Even after making sure that the supply was off. I thought that I had messed up and left it on.
It seems as though the 2510 has an electrolytic capacitor stored full of energy that does not drain off. It is enough to cause the power supply's regulator a big problem.
The diode can be a 1n4002 or anything close. The electrolytic capacitor can be a 100 mf at 35 volts. The other 3 capacitors are .01 at 1KV, usually ceramic type.
One other thing should be mentioned here. All chassis grounds should be kept to one location when designing and building power supplies. This is a must in rf proofing the unit.
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