Showing posts with label Power-Supply. Show all posts
Showing posts with label Power-Supply. Show all posts

Monday, July 06, 2015

Regulated Power Supply 30V 5A

This is a Regulated 0-30 V DC Power Supply manufactured by me in small numbers, 0-30V 5A and 5V -5A. It had a Switching Preregulator. This keeps the Vce across Transistor Bank at the Back of Instrument, at the lowest possible level, in order to keep them Cool. When Vce and Ic both are more in a Power transistor it will get heated more, then the efficiency of power supply is low.

Power Supplies Section - delabs

Variable Regulated Power Supply

The Output had both Constant Current Control and Constant Voltage Control. The CC control is also a Short circuit protection. The Output was protected from outside voltages damaging output circuits even when equipment is switched off. The back panel is a finned anodized black aluminum heat sink with many transistors.

The catalog that was made to market this product was made without computers around late 80s.


It was a Black and White catalog and was also mailed to many firms to build awareness of the product.


I looked for the circuits to scan them, i could not find it. I made-n-sold quite a few of them years ago. All of them work well even today as i over-rated most components. The cabinet was Steel for EMI-RFI Immunity, it was painted with Stipple Matt Powder Coating, the Cabinet maker had just learnt to give such a finish to his boxes.

Sunday, January 04, 2015

Voltage Regulators LM7812 and LM317

The LM78XX series of three-terminal positive regulators is available in the TO-220 package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut-down, and safe operating area protection.

Fairchild LM7812
Fairchild P/N LM7812

LM7812 


LM317

Adjustable power supply
"The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1.5A over a 1.2V to 37V output range.
    3-Terminal Adjustable Regulator

    LM317 Variable Power Supply

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