Circuit 9V ->6V

[PinkFloyd43]

I am working on a small circuit that blinks a LED
that I will create multiple items of to place around
my kids's apartment windows to hopefully deter bad
guy, flashing led could mean alarm, etc. Found a good
circuit but it calls for (4) AA batteries and want to
modify the input to support 9V source instead of the
(4) AA batteries.

The little kit, costs about $4.00 is perfect with the
exception of the source, have tried to simulate with
9V source with various divider circuits to lower to
output to 6V with min current to drive the LED?

Sorry for such a basic question but it's been (20)
years since I have played around with this stuff!

Thanks!

 

[PinkFloyd43]

Duh!, Right, looking for it now, I purchased these
years ago and have the PCB as a kit and thought I
had the schematic, still looking!

 

[PinkFloyd43]

Duh!, Right, looking for it now, I purchased these
years ago and have the PCB as a kit and thought I
had the schematic, still looking!

I finally said f it as I could not find the schematic
and simply hooked it up to a 9V source, so far no heat
build up on the (2) transistors or other components, now
wondering if the source will last longer or burn out the
parts quicker, will check the voltages after an hour or so

 

[neon]

Why dividers ??? just find out how much current 4 aa require and a add a resistor to drop the voltage to whatever. and finaly a belive if there are no IC involved it will work fine with 9v. and further more if this is a permanent installation why not a phone wall transformer to supply the DC LASTS FOREVER THAT WAY. 9v is safe for a child to touch. 30v is not . go to goddwill industry and buy those things for a song. People throw away thing or actualy replace with new better toys.

 

[Tom Biasi]

I finally said f it as I could not find the schematic
and simply hooked it up to a 9V source, so far no heat
build up on the (2) transistors or other components, now
wondering if the source will last longer or burn out the
parts quicker, will check the voltages after an hour or so

Measure the current the thing draws, maybe you can just drop the volts with
a resistor or zener.

Tom

 

[z]

I am working on a small circuit that blinks a LED
that I will create multiple items of to place around
my kids's apartment windows to hopefully deter bad
guy, flashing led could mean alarm, etc. Found a good
circuit but it calls for (4) AA batteries and want to
modify the input to support 9V source instead of the
(4) AA batteries.

The little kit, costs about $4.00 is perfect with the
exception of the source, have tried to simulate with
9V source with various divider circuits to lower to
output to 6V with min current to drive the LED?

Sorry for such a basic question but it's been (20)
years since I have played around with this stuff!

Thanks!

i've found that these days, things aren't nearly as sensitive to power
supply voltage as they used to be. whether it's those little wall wart
things which are horribly unregulated, or things that are run by 9
volt battery or off 12 volts from a cigarette lighter socket without
benefit of any circuitry in between;

 

[Tom Biasi]

I am working on a small circuit that blinks a LED
that I will create multiple items of to place around
my kids's apartment windows to hopefully deter bad
guy, flashing led could mean alarm, etc. Found a good
circuit but it calls for (4) AA batteries and want to
modify the input to support 9V source instead of the
(4) AA batteries.

The little kit, costs about $4.00 is perfect with the
exception of the source, have tried to simulate with
9V source with various divider circuits to lower to
output to 6V with min current to drive the LED?

Sorry for such a basic question but it's been (20)
years since I have played around with this stuff!

Thanks!

i've found that these days, things aren't nearly as sensitive to power
supply voltage as they used to be. whether it's those little wall wart
things which are horribly unregulated, or things that are run by 9
volt battery or off 12 volts from a cigarette lighter socket without
benefit of any circuitry in between;

True quite often.

Tom

 

[Don Klipstein]

I am working on a small circuit that blinks a LED
that I will create multiple items of to place around
my kids's apartment windows to hopefully deter bad
guy, flashing led could mean alarm, etc. Found a good
circuit but it calls for (4) AA batteries and want to
modify the input to support 9V source instead of the
(4) AA batteries.

The little kit, costs about $4.00 is perfect with the
exception of the source, have tried to simulate with
9V source with various divider circuits to lower to
output to 6V with min current to drive the LED?

Sorry for such a basic question but it's been (20)
years since I have played around with this stuff!

I give good chance that that the circuit will work plenty well from 9V
instead of 6V if all resistors that are in series with LEDs have their
values doubled or multiplied by 2.2 or use commonly available values close
to roughly or slightly over doubling.

If the circuit is intolerant of voltages closer to 9V than to 6V, then
it has great chance of working at 5V - use the common 7805 5V voltage
regulator IC (which has only 3 pins) to drop the voltage. Put a diode in
series with the "ground pin" if you want 5.5-5.6 volts, 2 diodes if you
need more like a bit over 6 volts. Maybe use 1N4148 if using one diode,
or use 1N400* if you use 2 diodes.

- Don Klipstein ([email protected])

 

[ehsjr]

I am working on a small circuit that blinks a LED
that I will create multiple items of to place around
my kids's apartment windows to hopefully deter bad
guy, flashing led could mean alarm, etc. Found a good
circuit but it calls for (4) AA batteries and want to
modify the input to support 9V source instead of the
(4) AA batteries.

The little kit, costs about $4.00 is perfect with the
exception of the source, have tried to simulate with
9V source with various divider circuits to lower to
output to 6V with min current to drive the LED?

Sorry for such a basic question but it's been (20)
years since I have played around with this stuff!

Thanks!

Put 4 1N4001 diodes in series between the 9V battery
and the circuit. Each diode will drop the voltage
by approximately .6 to .7 volts.

Ed

 

[PinkFloyd43]

Put 4 1N4001 diodes in series between the 9V battery
and the circuit. Each diode will drop the voltage
by approximately .6 to .7 volts.

Ed

This was the type of answer I was looking for Thanks!