Bedini Transistor Problem

[earthbound0729]

Hello All,

I seem to be having a Bedini Transistor Problem.

A little history first:
Coil is 8 filar
Transistors used- TIP3055, SC5027
Battery- 12 volt 18ah


I have built the Bedini circuit described in the Bedini Beginner's Handbook. I have noticed that the transistor Collector-Emitter appears to be in an open state as soon as I connect the run battery. This is proven because of the light I have connected across the Collector and base. I am using a 12 volt car light merely to check to see if there is voltage available at anytime. The base is not even energized in the normal way.
This is very bizarre as I even checked it without the Trigger coil wires connected to anything on my second go round and the magnets are not being rotated.
This is being done via a breadboard.

Any suggestions would be appreciated.
TY,
earthbound


I honestly cannot figure any other way that the circuit could be in an open state.

[TinselKoala]

Hello All,

I seem to be having a Bedini Transistor Problem.

A little history first:
Coil is 8 filar
Transistors used- TIP3055, SC5027
Battery- 12 volt 18ah


I have built the Bedini circuit described in the Bedini Beginner's Handbook. I have noticed that the transistor Collector-Emitter appears to be in an open state as soon as I connect the run battery. This is proven because of the light I have connected across the Collector and base. I am using a 12 volt car light merely to check to see if there is voltage available at anytime. The base is not even energized in the normal way.
This is very bizarre as I even checked it without the Trigger coil wires connected to anything on my second go round and the magnets are not being rotated.
This is being done via a breadboard.

Any suggestions would be appreciated.
TY,
earthbound


I honestly cannot figure any other way that the circuit could be in an open state.

Please post the exact schematic you are using, including how you are testing it.

[citfta]

Hello All,

I seem to be having a Bedini Transistor Problem.

A little history first:
Coil is 8 filar
Transistors used- TIP3055, SC5027
Battery- 12 volt 18ah


I have built the Bedini circuit described in the Bedini Beginner's Handbook. I have noticed that the transistor Collector-Emitter appears to be in an open state as soon as I connect the run battery. This is proven because of the light I have connected across the Collector and base. I am using a 12 volt car light merely to check to see if there is voltage available at anytime. The base is not even energized in the normal way.
This is very bizarre as I even checked it without the Trigger coil wires connected to anything on my second go round and the magnets are not being rotated.
This is being done via a breadboard.

Any suggestions would be appreciated.
TY,
earthbound


I honestly cannot figure any other way that the circuit could be in an open state.

Please post the info TK asked for.  But an equally important question is "What do you mean by open?"  To those trained in electronics open means having no connection like an open knife switch.  Open in electronics also can mean the transistor is defective and cannot turn on.  To those not trained in electronics open means to many of them open like turning on a faucet.  So do you mean the transistor appears to be on all the time with no power to the base?  Or do you mean it will not turn on?  Also as TK asked how are you checking it?  If your bulb lights when you connect one end to the collector and the other end to the emitter then that is normal with no signal to the base.  The 12 volts is going from the battery through the coil to the collector.  With the transistor off you should see the light light.  When the transistor turns ON the transistor then grounds the end of the coil so current can flow through the coil.  I am not sure which circuit you are using but the SSG that uses a wheel and magnets has to be spun by hand to get it to trigger the trigger winding and start the machine.

These are just some of the things I have seen from those new to electronics and the Bedini circuits.  I have helped dozens of people get their Bedini circuits working so I am sure we can get yours to work also.  If possible please include an actual picture of your circuit.

Carroll

[mscoffman]

I haven't looked up the transistors you are using but the standard 2N3055 NPN is supposed to be open off
(leakage only) when there is no base drive. The bipolar transistor transfer equation is Iec = Beta * Ibe.
a current amplifier. There may be some small current in the circuit used to bias the transistor *towards*
the on state normally - but

This is consistent with what I know of how the Bedini Circuit works; The Magnet moving towards (or away) from
the trigger coil is what drives the transistor closer to being fully on. This is a magnetic mirror where the coil reflects
what the magnet looks like to the coil back to it in reverse polarity. Pushing or pulling depending on the polarity from
versus to. So that when the magnet is closest to the coil the transistor is most fully on.

To have it any other way would be to inefficient. You would be wasting energy turning the coil on when the magnet
is very far from the coil. The Bedini circuit is inherently efficient.

---

Change your 12V light experiment around, the bulb should be connect to the power supply plus terminal,
the other side of the bulb to the transistor collector and connect the emitter to the supply minus terminal.

Now if you touch the transistor base to the PS plus terminal the bulb should begin to light. If you use a low
value of resistor in series with base like 10 Ohms the bulb should still light, but a high value like 10KOhms
it won't. If you happen to have a current range DVM, you could validate the transistor transfer equation
above.   

[earthbound0729]

THank you all.

I will post this schematic data a little later today.

earthbound.