EA-3033
EA Elektro-Automatik EA-3033 Laboratory DC Power Supply, 0-20 V, 20/30 A, analogue meters
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About the EA-3033
The EA-3033 is a high-current laboratory DC power supply ('elektronisch stab. Labor-Netzgerät') from Elektro-Automatik, Germany. Its front panel gives the rating as 0-20 V and 20/30 A.
Output voltage is set with a single 0-20 V knob. Moving-coil meters show output voltage ('Ausgangsspannung', 20 V scale) and output current ('Ausgangsstrom', 36 A scale, marked in colour from about 20 A upwards). Output is on a red and black terminal pair, with an Ein/Aus mains switch. Four power transistors (type 2N3772) sit on finned heatsinks at the rear of the steel case.
A supply like this is used where a low voltage at high current is needed, such as for motors, heaters, battery-powered equipment or vehicle electronics. EA does not publish data for this older model today, so only the panel markings are given.
Frequently asked questions
What does '20/30 A' on the panel mean?
The panel states the rating as 20/30 A without explanation, and no EA document for this model could be found. The ammeter scale runs to 36 A and is coloured from about 20 A up.
Is there a current-limit control?
Only a voltage knob is fitted on the front panel; there is no separate current-limit knob.
Specifications
| Meters | Analogue voltmeter (20 V scale) and ammeter (36 A scale) |
| Made in | West Germany (panel marking) |
| Outputs | 1 |
| Controls | Voltage knob 0-20 V; mains switch |
| Regulation | Electronically stabilised (panel marking) |
| Output current | 20/30 A (front panel marking) |
| Output voltage | 0-20 V (front panel marking) |
| Output terminals | Red and black binding posts |
| Pass transistors | 4 x 2N3772 on rear heatsinks |
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