Will Increasing the Voltage Affect the Functionality of My Circuit?

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michael7777
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I want to modify a circuit by adding a stronger drive motor.

The circuit is a PCB receiver which is attached to two motors, one which steers a car, one which drives a car.

The previous drive motor needed 2 x 1.5v batteries.
The new drive motor needs a 12V lead acid battery.
This means that 9 more volts will run through the circuit

Here is a block diagram:
Block diagram of an RF remote receiver IC: antenna feeds an R.F. circuit, then oscillator, timing generator, decoding circuit, counter, PLA, latch, and control logic, driving Turbo, Forward, Backward, Leftward and Rightward drivers for Motor 1 and Motor 2; power supply feeds all blocks.


Here is the annotated schematic:
Schematic of a radio-controlled car receiver circuit with antenna, IC RX2B, transistors Q1 to Q15, steering motor and drive motor, and a battery labelled 1.5V x2 (3V) and 1.5V x4 (6V).


I have more information about resistances if there is a need for it.

I am unsure of if the components will still work with such an increase in voltage. So it would be good if someone could advise.
 
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The first problem is that your annotation of steering and drive motor on the schematic is reversed.
The other is that substituting a 12v battery will burn this circuit up.
Some of the components could be reused but major changes are required.
 
I knew the 12v battery would kill the circuit. Since I am no good at making circuits ill just stick to using the slow 3v motor.