Questions tagged [power-supply]

Questions regarding devices for supplying power to electronics.

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0answers
54 views

First linear power supply build - design questions

I have decided to build my own linear regulated power supply to provide the power for an upcoming build. Since I'm no pro, I was hoping I could get some feedback on my design before building it, just ...
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2answers
79 views

How much power does an RTL-SDR draw?

Background: Last night (and the night before) I was playing with my RTL-SDR and GNU-Radio again. Working with my FM Receiver, (which was working previously by the way), I detected that last night I ...
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1answer
40 views

Passive receiver power needs & data rate

I'm working on a project to design a space-based low frequency array. It will only be receiving signals, and it will operate between 10MHz - 100MHz. It is made of short wave crossed dipole antennas. I ...
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0answers
69 views

Troubleshooting ICOM PS15 Power Supply

I got a power-supply gifted by my friend. When I powered ON, the main (120V) FUSE blows up. I started by disconnecting the transformer from the control circuit and powered ON. This time the fuse is ...
1
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2answers
99 views

From where do repeaters get their power supply?

I imagine that a repeater atop a building for which the repeater owner has sought permission would be sharing the same power source as that of the building occupants, but: What if the repeater is ...
1
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3answers
260 views

How to reduce voltage ripple of a linear power supply?

I made a simple linear power supply for my transceiver using 12V 30A transformer, four diodes RHRP3060 forming a rectifier and three 30_000 µF capacitors connected in parallel. I also used a 200 Ω 50W ...
4
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2answers
2k views

Practical differences between switching and linear power supplies?

Power supplies for ham radio equipment (and other equipment of course) seem to come in two flavours: switching and linear. The switching gear tends to be cheaper and smaller as well as more ...
5
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1answer
74 views

Powering transceiver and SWR/power meter from same supply?

I'm mostly sure this will be ok, but I'd like to confirm. I have a switching power supply (can't remember the model right now, but it's for ham use, 13.8V/30A) and I'd like to power both the FT-857D ...
1
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1answer
88 views

Parallel tube amplifier power supply using 6DE4 tubes [closed]

I’m looking to build a vacuum-tube based linear amplifier. I’d like to do it all tube based, including the power supply. The original ARRL design I’m looking at (from the 60s) has two paralleled 807s ...
5
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2answers
113 views

How can I sound-proof my generator?

Looking for advice to semi-soundproof my extremely noisy gas generator, which kept everybody edgy on Field Day. It's a real powerhouse, but the cost of that power is my hearing. I'm looking to buy or ...
0
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1answer
434 views

How to diagnose DRAKE TR7 power problem

My son was recently gifted a vintage DRAKE TR7 ham radio. It's been "in the attic" for 20+ years. When we try to power it up, the (separate) power supply turns on and we have checked with a multi-...
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1answer
87 views

Power supply for small radio board

I need a powersupply for a radio board (I will shield it), and have experienced bad interference from step-down converters. I have been told to use linear regulators (LM317 or LM350) with caps to trim ...
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2answers
539 views

Regulated Power Supply vs Class 2 AC/DC Adapters

I'm wondering if it would be more efficient for me to replace several AC/DC adapters (linear, non-switching) with a regulated power supply? Two of the adapters get very warm and are rated 9 watts ...
3
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3answers
318 views

Is using a generic DC 3V adapter dangerous to a radio?

I have the mini Eton radio and it has a DC 3V port but I haven't been able to find the official plug. Is using a generic one safe? How do i know if I found the correct AC adapter? It goes through 2 ...
2
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2answers
156 views

Ham Variable Lab Power Supply

I'm looking into purchasing a mobile radio (TYT TH-9800) for my Jeep Wrangler. I am hoping to be able to use it in my apartment as well. Since I'm going to need a power supply for this, I think it ...
5
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2answers
115 views

Stacked shell inductor — what's its function/use?

I have a device of copper and iron (about 8 kg) which looks like two shell inductors joined so that there is some coupling but high leakage. The windings seem to be identical. Each is a single ...
2
votes
1answer
71 views

Does the varactor bias supply have to be independent of Vcc?

A quick follow-up to How can I tell the frequency without an oscilloscope, or frequency counter? My supply is a transformer plucked from a dead power adapter rated for 1.5A. This is rectified cap-...
9
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3answers
182 views

What sources of power are useful in emergency situations?

Situations that call for emergency operating usually have some hams working in field conditions. Relying on the mains grid could be problematic. A lead-acid battery would probably be heavy to lug ...
3
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1answer
179 views

Does using a computer SMPS to supply a transceiver bleed hum into the signal?

A dedicated/custom power-supply for an HF rig may, on occasion, be unavailable. The internet lists any number of articles on the subject of modifying a computer power-supply. E.g. http://www.wikihow....