Hey gang! Been a long time lurker and can usually find my answers through other people's threads but I'm stuck here!
I modify and customize action figures, and currently I am working on a Transformers tank/robot.
I have a little dollar store LED/sound space gun toy I gripped the PCB out of to install in the tank turret. It has one red LED and a piezo for the sounds. It uses a momentary switch to cycle through 7 variations of sound and light.
I also have a dedicated blue SMD size LED for the eyes. Running off a slider switch to turn it on and off.
Because of the space constraint's in an action figure I want to run both circuits off one power supply (4.5v, three button cells LR44 I think).
It all works great except when the "eyes" are on and I activate the cannon LED/sounds, the PCB for the LED/sound seems to steal the power and I lose the blue LED eyes while the other circuit is functioning.
I have tried a resistor on the LED that is in the sound/LED module. No good, also I tried a capacitor on the "eye" LED thinking it may hold enough voltage to power it during cannon "firing", also to no avail.
I cannot tell the IC used on the PCB because of the black epoxy dot over it. I'm thinking something like 555, because I only see 7 traces on the PCB.
The piezo and red LED are on the same two traces on the PCB, and the pitch and light behave the same, as far as pulsing and emitting sound at the same rates.
I can add another component if it's small enough, but I'm getting real cramped as is (Ive got the PCB under the turret, which must also share the robot's head and arms, plus the back side of the switches.
To summarize, I want to turn the blue "eyes" on and off at will, and when on I want to be able to activate the PCB gizmo without affecting the output of the eyes LED, All running off one power source.
Sorry for the long read folks, just trying to give as much info as I have.
I modify and customize action figures, and currently I am working on a Transformers tank/robot.
I have a little dollar store LED/sound space gun toy I gripped the PCB out of to install in the tank turret. It has one red LED and a piezo for the sounds. It uses a momentary switch to cycle through 7 variations of sound and light.
I also have a dedicated blue SMD size LED for the eyes. Running off a slider switch to turn it on and off.
Because of the space constraint's in an action figure I want to run both circuits off one power supply (4.5v, three button cells LR44 I think).
It all works great except when the "eyes" are on and I activate the cannon LED/sounds, the PCB for the LED/sound seems to steal the power and I lose the blue LED eyes while the other circuit is functioning.
I have tried a resistor on the LED that is in the sound/LED module. No good, also I tried a capacitor on the "eye" LED thinking it may hold enough voltage to power it during cannon "firing", also to no avail.
I cannot tell the IC used on the PCB because of the black epoxy dot over it. I'm thinking something like 555, because I only see 7 traces on the PCB.
The piezo and red LED are on the same two traces on the PCB, and the pitch and light behave the same, as far as pulsing and emitting sound at the same rates.
I can add another component if it's small enough, but I'm getting real cramped as is (Ive got the PCB under the turret, which must also share the robot's head and arms, plus the back side of the switches.
To summarize, I want to turn the blue "eyes" on and off at will, and when on I want to be able to activate the PCB gizmo without affecting the output of the eyes LED, All running off one power source.
Sorry for the long read folks, just trying to give as much info as I have.
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