Hi there i want to turn on solenoid valves depending on frequency
i am thinking of f to v converter so that i use a comparator to turn on the wanted valve.
i bought the lm2907 but the schematic is confusing will the circuit of page 16 work?
thx
Hi there i want to turn on solenoid valves depending on frequency
i am thinking of f to v converter so that i use a comparator to turn on the wanted valve.i bought the lm2907 but the schematic is confusing will the circuit of page 16 work? thx
You may want to consider using an LM567 Tone Decoder. From the datasheet (**broken link removed**):
The LM567 and LM567C are general purpose tone decoders
designed to provide a saturated transistor switch to ground
when an input signal is present within the passband. The
circuit consists of an I and Q detector driven by a voltage
controlled oscillator which determines the center frequency
of the decoder. External components are used to independently
set center frequency, bandwidth and output delay.
Yes the given application and the schemtaic on page 16 will work fine for you. But the frequency input should be in the limits of the device. Read the datasheet carefully and then impliment the circuit. In case the input frequency is above 10Khz , you amy consider the sugession given by "GSM man" Good luck.
I am going to use an audio signal and consider two valves for now i.e. two frequencies. thinking to usr a comparator at the output to select two voltages and accordingly turn on valves.
btw I know that this can be done using plc or microcontroller but the point is that I should not use them
thx
Good Luck to you too
I have tried the circuit with some modifications in R and C vor every 1k I am getting a 1V ( linear change)
I just want to thank pranam77 your support.
I have connected the circuit on the datasheet then used two comparators and two 9v relays to which 3 pums were connected.
the input is and audio signal was used from my pc.
the performance was outstanding.
It just needs a lighting system