Picture details

Some module characteristics.

1.5 Amp maximum

1% output voltage accuracy

0.01%/V line regulation

80dB ripple rejection

Capxon 0.024 ohm 35mm tall capacitors

High power choke

Dimensions 95 x 54 and 54 mm tall inclusive the heat sink

45 mm tall without heat sink

Slow blow fuse of 1A

Voltage setting 5.0V and 9.1V +/-accuracy.

See IC specification PDF file here

Shielded by the capacitors and heat sink a small green LED indicates that the supply module is powered up. Extra space is provided to mount an additional capacitor if desired. Also via the points YC+ and YC- a separate external capacitor can be mounted for additional pre-regulation smoothing. In-between the ribs of the heat sink the ventilation is improved by additional holes in through the PCB.

The IC1A mounting as shown on the picture in combination with the IC1B mounting allows for side mounting of the regulator IC. In this way an external heat sink can be used or the cabinet inside wall can be used as heat sink.

The input section with the AC inputs Y1 and Y2 allow for a normal AC signal to go to the bridge. The capacitor mounting places C9 to C12 are optional and allow to improve on the bridge behavior.

In case a mid tap transformer is used the lower diodes need to be opened as shown on the photograph and the fuse needs to be bridged. Y3 serves now as the mid tap input. The benefit is less diode resistance as only one diode will be in series with the current in the loading phase. In the normal bridge configuration always 2 diodes will be in series with the current.

The power supply module is a straight forward design. By the use of modern high quality components and a configuration allowing a versatile use, an optimum was reached. In the application information you can download here you will see that various configurations are possible.

One transformer
Two or more transformers
Mid tap transformers
12V DC battery
2 module configuration
3 module configuration

See what fits your ideas best, every solution has benefits and drawbacks. You can try them also one by one.

Important note:

On the display PCB of the CD configuration there is a master reset circuit. This circuit expects the power supply to rise between 3.6 V and 4.9V within 200 msec. That is normal for a normal power supply.

If this does not happen then the RESET does not work proper and the system does not boot.

Do not add capacitors to an extend your system does no longer boot correct.

If you add capacitors you need to increase the power of your transformer as well otherwise it does not make sense. We suggest not to go over a transformer coil rating of more then 3 Amperes as a higher value does not make sense. If the fuse blows when loading your capacitors you may increase the fuse to 2 Amp maximum.

It is however a sign of going to the edges of the desired.