Hi
have started a project using these ultrasound sensors and the following circuit to drive them (c/- Patrick Mitchell and HobbyTronixStore) as my eletronic theory is about 30 years old and hazy
R1 - 220R
R2 - 220R
R3 -390R
R4 - 5k6
R5 - 1k8
R6 - 1k8
R7 - 10k
Q1 - 2N2222
C1 - 0.01uF...with a VCC of 9volts
This works fine and produces a square wave output of roughly 8.5 volts but there are a couple of things I am not sure of.
The 555 output is roughly 8.5 volts too so am not sure what the transistor is doing there apart from acting as a 1:1 driver.
I want a sine wave output, so connected up a signal generator to resistor R4 and found the output from the transistor has been saturated so that I am still getting a square wave....How would I produce something similar with a sine wave input to the transistor.
have started a project using these ultrasound sensors and the following circuit to drive them (c/- Patrick Mitchell and HobbyTronixStore) as my eletronic theory is about 30 years old and hazy
R1 - 220R
R2 - 220R
R3 -390R
R4 - 5k6
R5 - 1k8
R6 - 1k8
R7 - 10k
Q1 - 2N2222
C1 - 0.01uF...with a VCC of 9volts
This works fine and produces a square wave output of roughly 8.5 volts but there are a couple of things I am not sure of.
The 555 output is roughly 8.5 volts too so am not sure what the transistor is doing there apart from acting as a 1:1 driver.
I want a sine wave output, so connected up a signal generator to resistor R4 and found the output from the transistor has been saturated so that I am still getting a square wave....How would I produce something similar with a sine wave input to the transistor.