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Bench Power Supply

I've made a bench power supply that puts out 12Vdc, 5Vdc and 3.3Vdc. How can I now make it variable ?

I've tried a potentiometer but I can not get it to work. I'm not sure if I'm hooking it up correctly.

I gotta go with Eugene on this one, best way is to add a variable voltage regulator from one of the outputs and you can then change the output voltage. If you just use a pot, then you will have to keep checking the output voltage (under load) to make sure you haven't loaded your power supply.
The circutry isn't too difficulty to build, you could easily make one fit on a 2" square brassboard (if you can solder).

And you mentioned you weren't sure if you hooked the pot up correctly, just go from center contact to either side contact (that works like 99.9%) if you go to both sides, you turn your pot into a fixed resistor. Also, you might want to make sure it has a linear taper (The resistance changes the same amount per revolution), to make 'dialing in' your voltages easier.

Pr30 - Tripp Lite Dc Power Supply - Dc Power Supply $150.5 precision Regulated DC Power Supplies Are Ideal For Commercial/land-mobile, Ham And CB Radios, Test Bench Supplies, Base Stations, Tape Players And Amplifiers. Designed For Years of Reliable Service And Superior Performance, They Efficiently Convert 120 Volts AC Into 13.8 Volts DC (+/-0.5v). The Trim Line Series of DC Power Supplies Offers a Low-profile Design With a Footprint That Matches The Most Popular Radios on The Market, Such as Motorola, Radius, GE Monogram Series And EF Johnson Models. [304016] UPC: 037332060174 UNSPC: 39121004 14L x 7.2W x 7.1H 20.85 LB 0.41 Cubes

Pr 40 - Tripp Lite 200W Dc Power Supply - 200W - Dc Power Supply $186.72 200w DC Power Supply is Ideal For Commercial/land-mobile, Ham And CB Radios, Test Bench Supplies, Tape Players And Amplifiers. Designed For Years of Reliable Service And Superior Performance, it Efficiently Convert 120 Volts AC Into 13.8 Volts DC (+/- .5v). It Offers a Low Profile Design With a Footprint That Matches The Most Popular Radios on The Market, Such as Motorola, Radius, GE Monogram Series And EF Johnson Models. [937477] UPC: 037332060075 UNSPC: 39121004 28.6 LB 0.8 Cubes

Pr60 - Tripp Lite Pr60 300W Dc Power Supply - 300W - Dc Power Supply $252.35 300w Dc Power Supply Is Ideal For Commercial/land-mobile, Ham And Cb Radios, Test Bench Supplies, Tape Players And Amplifiers. Designed For Years Of Reliable Service And Superior Performance, It Efficiently Convert 120 Volts Ac Into 13.8 Volts Dc (+/- .5v). It Offers A Low Profile Design With A Footprint That Matches The Most Popular Radios On The Market, Such As Motorola, Radius, Ge Monogram Series And Ef Johnson Models. [304022] UPC: 037332060082 UNSPC: 39121004 16.1L x 11.7W x 7.4H 37.3 LB 0.81 Cubes

Medfusion Power Supply $142.6 Medfusion Power Supply

POWER SUPPLY $82.99 POWER SUPPLY

Power supply $118.99 Power supply ( internal )

power supply $39.99 Athenatech - Power supply ( internal )

Respironics Universal Power Supply $191.7 Universal Power Supply for use with Avant 9600 Pulse Oximeter.

Respironics Replacement Power Supply $69.13 Replacement Power Supply for Smart Monitor 2 Apnea Monitor.

Associated Equipment 20A/25A Peak Output Bench Charger/Power Supply $505.95 Electrical Stability System (ESS?) technology provides a stable power supply for extended service procedures or re-flashes Nominal 13.7V DC Output Programmed for deep discharge recovery of flooded batteries Patented diagnostics indicate weak or defective battery Charges all types of 12 volt batteries Designed for AGM, Gel Cell, Sealed, and Standard Flooded batteries including Spiral Cell, Orbital, or Optima batteries

Morley Regulated Power Supply $19.95 Morley Regulated Power Supply; 9 volt power supply for all Morley pedals. No more need for batteries!  This power supply will feed power to any of your Morley Guitar Effects Pedals.

Dunlop ECB002 AC Power Supply $9.31 Power supply for GCB-100 Bass Crybaby.

Va-100P-5 - 10-Outlet Power Supply $396 This AC Power Supply is an Efficient Ten-outlet Universal Switching Power Supply That Can Supply 5V DC at up to 8a. It is Designed to Operate Kramer Products That Use an External 5V DC Power Transformer. [2965576] Truck Delivery UNSPC: 39121004 13.78L x 8.86W x 3.15H 5 LB 1 Cubes

Ibanez AC109 Power Supply $15.29 This standard Ibanez power power supply supplies 9 volts, 200mA of power for Ibanez pedals.

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DIY bench power supply with voltage regulator.



Computer doesnt boot. Do I have a bad motherboard or CPU? How can I tell?

I have only the power supply, CPU and motherboard connected. It is on the bench not touching the case. When I turn it on...the power supply fan starts...then stops for 4 seconds...then starts again and stays on. I do not hear a POST beep. I have tried a different power supply with exactly the same results. Gigabyte GA-P35-DS3L motherboard with Intel E6750 processor both 2 months old.
I have unplugged everything except the power supply, CPU and motherboard. I should be getting a POST error beep, but I get no sound when the computer starts.
The power LED on my box only has one color. It stays green when the power is to the system. It turns off during the 4 second "pause." My bigest question is what that pause means...

Only way I know is discovery by elimination. Also the CPUs can generally withstand much more than a motherboard can. Usually failure is caused by damage from heat, and the motherboard is the the most susceptible and first to go.

You have already eliminated the power supply. It has to be either the mb or cpu. I vote for cpu.

Disregard the first answerer, because he assumes you have a hard drive connected. You said you only have mb, cpu, and ps connected. I assume you also have at least one memory stick in. As the 2nd answerer stated, that could be bad, but is easily checked by inserting a different memory stick. Before doing that, however, make sure that the memory stick is inserted in the first slot (consult your mb diagram to see which is the #1 slot - it may be labeled). I also assume that you have already tried reseting your CMOS jumper, and that the jumper is not in the shorted position (again consult your diagram). That being said, I have also encountered bad Gigabyte motherboards that were almost new, and new.

You said will not boot. I assume you mean that you have it hooked to a monitor, and nothing will show on the monitor. It should show something, even without a hard drive.

Tags: bench, bench power supply, bench power supply diy, bench power supply kit, bench power supply review, bench power supply schematic, diy, electronics, power, supply

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