That's exactly what this circuit does. It combines the functions of a voltage doubler, tripler and quadrupler . Connect your transformer secondary to its input and youll get 2, 3 or 4 times the input ac voltage as dc, dependent on where you take your output.
I've used this circuit to provide dc voltages between 18-200V dc with transformer secondaries from 6VAC-40VAC.40VAC is a practical limit to this board because of the voltage rating of the caps. Nevertheless I've operated relays motors and the odd valve circuit with this device.
As you can see from the circuit diagram the device is a modified voltage quadrupler with multiple voltages taken from various points in the circuit.
D1,2,3 and 4 = 1N4007
C1,2,3,4 = 100uF/100V
Strip-board panel 11 strips x 22holes
6W Terminal block
3mm Thick plastic panel 55mm x 83mm
3 M3 x 16mm screw, nuts
The circuit diagram is shown below. AC power from the transformer secondary is fed through the Capacitor Diode network to produce rectified multiples of the input voltage. In fact the circuit consists of several half wave rectifiers in series. The only disadvantage of the circuit is that the ripple voltage tends to be a bit high but this can be helped by connecting a further smoothing cap(s) in parallel with the output terminals. When driving relays motors and other such devices this is irrelevant.
It's almost a must to mount the diodes first. Otherwise youll end up struggling trying to insert them between the caps.(take it from me! ) Also it makes life easier to temporarily hold components into position with a piece of masking tape to stop slippage when soldering. Note that the diodes are soldered the right way round. Polarity is indicated by the light band at one end of the component.
Next install the electrolytic capacitors C1-4. Again these are polarised as indicated both on the component body and layout diagram. At this stage the board is finished and can be put on one side while attention is turned to the plastic panel.
The plastic panels are available in most model shops in A4 sheets for a couple of quid and are easy to cut into smaller panels by marking them out and cutting along the lines with a scalpel. A Mechanical drawing is shown for the panel below. Simply mark out your plastic panel and drill the M3 clearance holes and this task is completed.
Lastly final construction. Attach flying leads to the board at the points indicated leaving these about 6(150mm) long. Mount the board with an M3 screw and tighten it down to the plastic panel. Similarly mount the terminal block and connect the ends of the flying leads as shown in the layout diagram. The project is now ready to use.