The other way to check the current of the connected load is by checking the spec sheet of that load.
BC557 VS BC547 HOW TO
You will also find many tutorials on Youtube on how to check amperes.
This can easily be checked with a digital multimeter by selecting the ampere option and connecting its two leads between the load and the transistor. If you want to replace it in a switch circuit, it should be noted that the collector current of C1815 is higher than that of BC547 so first of all you have to find out what load C1815 is driving and how much current that load is using. You can easily replace BC547 with C1815 in amplifier, preamplifier, oscillator, and RF circuits but you cannot replace it in all switching circuits because C1815 has a higher collector-emitter voltage and also higher collector current. You can use BC547 in place of C1815 in some conditions and in some conditions you cannot. If the frequency is higher then you have to find some other alternative that has a higher transition frequency. But if you want to replace it in an RF circuit then the frequency of the circuit must be around 80MHz. Moreover, you can also replace C1815 with BC547 in other circuits easily such as an amplifier or preamplifier and the output will have not much difference. Ratings & Characteristics Comparison : Ratings & Characteristicsīy looking at the above ratings and characteristics chart we can see that C1815 has a higher collector-emitter voltage and also higher collector current due to which you can easily replace BC547 with C1815 in any circuit where it is used as a switch. While the BC547 transistor’s first pin is “Collector” second is “Base” and third is “Emitter. The C1815 transistor’s first pin is “Emitter” second is “Collector” and third is “Base”. As shown in the pin comparison chart above we can see that the pin configurations of both transistors are different.
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