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Dual Battery

Dual Battery

Using rechargeable batteries to power circuits is a proven method for providing energy to mains-independent equipment. A major disadvantage of this is that the battery usually turns out to be empty at the most inopportune moment. As a user, you are unexpectedly confronted with the fact that the circuit suddenly doesnt work any more. Sometimes this is only a minor inconvenience, but at other times it can be a catastrophe. For instance, just imagine what happens to a model airplane if the radio receiver stops working in flight due to an empty battery. We can assure you that the consequences are anything but pleasant.

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Component list

(all R and C: SMD 0805 case)


R1,R2,R5,R6 = 100kΩ

R3,R7 = 1MΩ

R4,R8,R9 = 10kΩ

R10,R11 = 1kΩ



C1-C6 = 100nF



D1-D4 = BAT54 (SOT-23)

D5,D6 = LED rood (SMD 1206)

IC1,IC3 = 4093 (SOIC-14)

IC2,IC4 = LM809M3-4.38 (SOT-23)

T1,T2 = IRF7329 (SOIC-8)

T3-T6 = FDV301N (SOT-23)



Connecting wires

PCB no. 070343-1

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