1284Views4Replies

Author Options:

how can i amplify an electronic signal, or how can i let this weak signal trigger an circuit? Answered

Comments

The forums are retiring in 2021 and are now closed for new topics and comments.
0
lemonie
lemonie

11 years ago

What weak signal and what circuit? The answer may involve at least one transistor, but it would help to know what you've got. L

0
bobiebob
bobiebob

Answer 10 years ago

well, it would be a quite easy circuit. I just want to use a kitchen timer (which gives a really weak signal to the speaker) and let this start another circuit which runs on a 9v battery and lights a light.

0
lemonie
lemonie

Answer 10 years ago

You've got a switch in the timer, is it electronic or mechanical?
But all you'll need is something for it to turn on.
Simple transistor I think, so I'll guess a diagram:

L

t.bmp
0
cryptopsii
cryptopsii

11 years ago

lemonie is right, we need a bit more info: if it is a digital signal you will need a bipolar transistor in saturation mode or juste a plain mosfet. if it is an analog signal and you need more power (higher voltage AND higher current) you will need one or more transistor in analog mode... if you only need an higher voltage a simple Op amp (google for 741 op amp) will do it.