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Three Terminal Regulators- Unadjustable

These are simple, effective and interesting integrated circuits. They are short circuit protected, can stand up to 32V, have thermal protection and they can easily deliver regulated voltage with 1 amp of current. In these ICs, the last two digits give you the regulated voltage they deliver, 7806 gives you 6 volts and 7812 gives you 12 volts and so on. These are available from most of the manufacturers and are cheap. They are connected after the conventional power supply. There should be 3V more than the required voltage at the input for proper regulation. You need 9V for a 7806 regulator. Use this circuit whenever single regulated voltage is required. Pinout and heat sink mounting procedure are given in figure 11 and Figure 12 respectively.

solder the three terminal regulator after the bridge. Connect the input pin (1) after the bridge and capacitor. Connect the common terminal (2) to the negative rail and you have the regulated voltage at the output (3). 47 uF capacitor (C2) is required if the regulator is placed faraway from the main power supply.

Metal bodies of these ICs are connected to the ground (common) terminal. Follow the mounting procedure as given below and fix a small aluminum plate to remove the heat and to improve its current capability. (This is a standard practice to mount heat sinks on ICs, transistors, SCRs, and triacs, etc.) By now you must have caught up with the art of soldering and the IC should be soldered well and fast.

Schematic 4 shows a 9V regulator appended to 12V power supply of the earlier bridge power supply of 12V DC.

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