I tried to rebiuld a Don Smith Device

[Google]

Hi, thanks for replying.

What I am asking is as follows :

1. We have one 12V DC accumulator say 7Ah.
2. We have two 12V DC 22 Watt identical bulbs.
3. We have a circuit "X" which has input wires connected to 12V accumulator.
4. Our circuit "X" has 4 output wires, each set of two going to each 12V/22W bulb.

We want our circuit X to be made in such a way that it cyclically powers bulbs one after the other. And we should be able to control the speed of the cycles.

Best,

[gyulasun]

Hi Google,

Basically you need an astable multivibrator. See this link but you have to use transistors able to handle the 22W bulbs current taken from 12V battery.  Also, resistors R1 and R4 should be omitted, they are current limitiers for the LEDs when transistors are ON.

http://www.next.gr/oscillators/astable/astable-multivibrator-with-two-led-l8272.html

Gyula

PS if you search by google with words ' astable multivibrator '  you will have tons of explanations and schematics.

[Farmhand]

Hi, thanks for replying.

What I am asking is as follows :

1. We have one 12V DC accumulator say 7Ah.
2. We have two 12V DC 22 Watt identical bulbs.
3. We have a circuit "X" which has input wires connected to 12V accumulator.
4. Our circuit "X" has 4 output wires, each set of two going to each 12V/22W bulb.

We want our circuit X to be made in such a way that it cyclically powers bulbs one after the other. And we should be able to control the speed of the cycles.

Best,

See attachment for circuit to alternate two 12 volt globes. The inverter circuit I modified to get the drawing attached is the 8th schematic down using the CD4047 as the oscillator chip. One wire from each bulb is connected to the 12 volt rail and the other is switched alternately through the two mosfet switches, a CD4047 drives the mosfets just fine at lower frequencies. The 1K resistors to the mosfet gates is not exactly how I would do it, I would remove those and drive direct from the CD4047 outputs to the mosfet gates and place a 2k - 10 k resistor from the gate to the ground to ensure the mosfets turn right off.

8th circuit down on this page is the one I modified to get the circuit attached. Don't be concerned with using mosfets they are great for switches.
http://circuit-zone.com/?cat=AC_DC_Inverters

Cheers

[Google]

Thanks a ton farmhand and gyulason. 

Best,

[Google]

Tesla was an electrical genious but he wrote his patents very elusively. Till we try replicating them, we wont get the underlying meaning of the term "Complex currents", that he has frequently used in his patents.   


Best,