Re Power 1.5V Light Bulbs

Bob, in the top drawing the bulbs would be in parallel as output effectively is 1.5 volts RMS DC from the diode (ignoring the forward .6 volt drop). In the bottom drawing the bridge rectifier serves no purpose as the series wiring distributes half voltage to each bulb (assuming they are identical). Another way I described was to take a bridge rectifier with the + and - connected and place it in series with a load ( the 2 AC leads marked ~),such as to a lamp post for example. Tapping these 2 leads will clamp about 1.2 volts whenever the load goes through the rectifier (when the lamp post is lighted,for example). 2 rectifiers this way in series would clamp about 2.4 volts. This is useful in lighted cars needing marker lights or installing directional lighting in locomotives.

In this example below in the link where the paired diodes are in series with the motor circuit

http://www.jcstudiosinc.com/Bl...d=488&categoryId=426

5 paired diodes would clamp + or - 3VDC whenever the motor(s) is running,polarity depending on train direction. Tapping this with a 3 volt bulb would give non directional lighting. With a blocking diode it could be made directional. Tapping it with an LED would give directional lighting.

Dale H

Dale H,
I changed the diagrams in the top post, but I am not sure about the circuit with the bridge. From your explanation above, I get the sense that the bridge is in series with the power supply and light bulbs. Is this correct?

Yes

I have no way to draw it right now. If you look at the post with the diodes in series with the engine motor you simply tap the 2 ends of the string. Whenever the motor runs it clamps 3 volts.

Dale H