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Darlington
Pair |
How the circuit works ..
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Gain = hFE for BC108 x hFE for BFY51 Other useful Information: Please see P1 and P5 also. The BFY51 transistor can power output devices with current
up to 1 amp (Ic = 1 amp). This output will be sufficient to drive small
motors and relays and outputs where devices are connected in parallel.
The BCX38B is a Darlington Pair in a single package. It can take the place of the two transistors shown in the dotted box in the circuit diagram above. It provides about 0.8 amps output current (Ic). Being a low-cost item, it makes a good alternative, but please note the leg connections shown above when connecting up. |