Hello all,
I need to repair a board where the original circuit had a BCR512 transistor with built in 4.7 kΩ bias resistors switching a Nais JQ1aP-24V relay (8.3 mA, 2880 Ω).
Someone repaired it with a 2N3904 transistor and resistors R1 10 kΩ, R2 22 kΩ. The circuit worked but not for a very long time.
Now I want to use a BC337 transistor but I don't know what values for the resistors should I use. Or if someone could point me a better approach by using a Mosfet it would be great.
I found calculators for the base resistor but I am not sure about the base-emitter resistor.
edit: the input switching voltage is 5V
I do electronics stuff as a hobby so I still have a lot to learn... Any help will be appreciated!
I need to repair a board where the original circuit had a BCR512 transistor with built in 4.7 kΩ bias resistors switching a Nais JQ1aP-24V relay (8.3 mA, 2880 Ω).
Someone repaired it with a 2N3904 transistor and resistors R1 10 kΩ, R2 22 kΩ. The circuit worked but not for a very long time.
Now I want to use a BC337 transistor but I don't know what values for the resistors should I use. Or if someone could point me a better approach by using a Mosfet it would be great.
I found calculators for the base resistor but I am not sure about the base-emitter resistor.
edit: the input switching voltage is 5V
I do electronics stuff as a hobby so I still have a lot to learn... Any help will be appreciated!
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