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Last Updated: December 26, 2012

FULL WAVE regulator schematic

A full wave regulator is a type of regulator mostly found on small motorcycle that can enhance the charging system of motorcycle battery. It can be bought in a four pin or in a five pin configuration as shown on the left. It is also being used widely by enthusiast that convert their single phase half wave generator onto a full wave by altering the stator windings.

Wondering what is inside this kind of regulator and how it differs from those commonly used HALF wave regulator, you are in luck for i have the time and resources to open up this donor regulator. it took me hours of heating up, scraping the coating to expose the main board and parts.

Here it is.

with the help of a portable blow torch, soldering iron, a small flat screwdriver, and a bit of patience, I carefully removed the top coating of this regulator exposing the bottom of the PCB. and noticed the smd (surface mount devices). Seeing that makes me more careful of not scrapping them from their location.

Patience is the key when doing this kind of hobby.

HOURS later,

Have to desolder first all components to pull out the pcb.

 The bridge rectifier that needs to be heatsinked.
 the epoxy residue..(too tough to scrape)
 top view
 side view

back view

And the schematic of this board

By comparing this to my previous post

Single Phase Shunt Regulator (full wave)

They are almost identical, but as i have said, the regulator above is a five wire type, the schematic shown on left is a four pin type. The difference, the circuit within the link is always connected to the battery thus leakage is present. while as this regulator has a wire (BLACK) that is connected after the ignition switch and not directly to the battery.

It was used for one reason:

1. when ignition off, monitoring circuit of the schematic is disabled, no current will be taken from the battery when stored, or park.

We have a saying " its better to have more than to have enough" This particular five wire regulators can be used on four wire type. just connect the black and red together..

By looking at the schematic, and comparing it to my previous post of voltage regulators, it is almost identical, with the design, and only component values are different. C1, R1, Q1, D1, and R3 compromising the sensing and regulating circuit, whereas D2,D3, Q2 and Q3 are the shunting components of the stator winding.

D4 to D7 are your rectifiers that converts the AC coming from the stator to DC for charging your battery. With the values as shown, the output of this regulator is 14.4 at 5000rpm. You can modify this circuit for your intended application, to output 15 volts rather than 14.4 for quick charging of your battery when there are too much load on your system, by altering D1, to 13 volts rather than 12.6 volts..
This system is Stator dependent...meaning, this can't output more power on what your stator can give, all charging system power rely on your stator max output...

Note: further again..the generator to be used here do not touch the ground or not connected to any ground. 


Darus SA said...

The circuit before scr, can I replace with simple LM7815?

Nathaniel Berdan said...

I dont think so, i know what you are thinking, the circuit you are trying to replace is the monitoring circuit. It function like a level meter of the battery so that when the battery voltage drop to a calculated level within that circuit, It will shutdown the SCR from clipping the stator winding, and when it do sense that the battery is at the maximum voltage , that is again sense by that circuit, it will trigger the SCR shunting the winding to ground so that minimal current will be feed to the battery..LM7815 will never i think will do both..

Yasir Isnan said...

How many SCR to fit if the winding of stator are 3 wire? Is six? Or you have a formula or an alternative circuit?

Unknown said...

Hi, what is the brand name of this regulator? Does it have any identifying marks outside the case of this module? Please let me know so that when i buy a full wave regulator, this is the one i'm going to ask at the store. Thanks

Unknown said...

Have you seen any versions of the fullwave reg/rect with additional outputs?

I've found one with the four usual wires (R,G,W,Y) plus an additional red/white wire, which looks to be used to power the auto-choke/enricher on some models. I'm wondering if that is an output (12vdc?) that is only active while the engine is running, and could be used to power headlights, either directly or through a relay, such that they're only on when the engine is running.

I've also seen some with 6 wires (R,G,B,Y,Pink,White) where I suspect that it may be the same as you show here plus an "engine running" output on the white wire.

Gleen Odan said...

I have a motorcycle with no battery I can't connect the 5 wire regulator to stator because I confused the stator wire is 4 wire black white yellow and red my question is how to wire stator to regulator?

Hector gomez saravia said...

se me ocurre sustituir los scr por un solo triac.

Cornelio Manimog said...

Good day sir, me I know if how many Amps the Positive of this regulator?

Cornelio Manimog said...

Good day sir, may I know if how many Amps the Positive of this regulator?

Alberto Bastida said...

please i need the reference of tis regulator, please, i nedd purchase one

Benks said...

is this a gy6-125 4pin rectifier that can be used as a full wave rectifier for mio?

Albert said...

Gud day how wire this rectifier with 5 pins in honda tmx 155 with 4 pins ...pls help badly needed tnx in advance

Nathaniel Berdan said...


kindly search for the schematic diagram of the 5 pin regulator here. What you looking for was inside an article here.

Dino del puerto said...

Good eve sir,pwedi ba ang bridge na 1000v 35a ipalit ko sa mb254?

Mr. kaushal said...

Sir thyristor kitne amp use kiya hai es circuit me

sukmo widyantoro said...

The Bridge Diode MB254? I tried to find them but it is very hard to find in my country, Indonesia. can it be replaced with other series?