33uF, 50V, Radial LeadsĬapacitor, Ceramic. Switch, SPDT, Toggle, Right Angle, PCB MountĬapacitor, Electrolytic, 1000uF, 50V, Radial LeadsĬapacitor, Ceramic.

Table 1 lists the parts required to construct a BBPS-1 regulator. The reference numbers on the PCB agree with those in the schematic diagram above and the parts list in Table 1. As you see, no surface mount parts are used. The photo below shows a bare printed circuit board on the right and a finished assembly on the left. Other voltages require a different U1 and R1 more information about that is provided in the next section. Note that the schematic above is for a 5V regulator. PH1, PH2, PH5, and PH6 are also pin headers which allow both +V and ground to be selectively disconnected from the power rails on the breadboard. PH3 and PH4 are pin headers which plug into the power and ground rails on the solderless breadboard.

Resistor R1 and LED1 provide a visual confirmation that U1 is working. C1 through C4 provide filtering, noise suppression, and oscillation suppression for U1, which is the actual regulator IC. SW1 is used to switch the DC input on and off, and R2 provides a quick discharge path for C1, thus avoiding a slow bleed down. J1 is a power jack where the external AC to DC converter connects D1 is a Schottky diode which prevents reversed polarity voltage from reaching the other components. The schematic is reproduced below click on the image for a larger version. The circuit for the BBPS-1 is far from revolutionary, but offers some features not available in other breadboard compatible regulators. Coupled with a readily available 'wall wart' AC to DC converter, the regulator (called the Breadboard Power Supply 1, or BBPS-1) will quickly become a favorite on your workbench. The same low cost printed circuit board can be used for the voltage of your choice, and Gerber files are provided later in this article. This project will supply all the information required to build a rock solid linear voltage regulator in any of 9 voltages from 2.5V to 15V that will provide enough current for many small circuits. However, there are times when you need only a single voltage supply and it would be an added benefit if it were compatible with a solderless breadboard. A bench power supply with multiple outputs adjustable for voltage and current is just right for some applications.

Diptrace schematic tutorial