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Hi, I'd like to ask if the schematic below will work. It is an IR and ultrasonic transmitter. I'd like to transmit the IR and ultrasonic differently that's why I connected it with different transmit pins. Can you help me please. Thanks.
MC14093 is a Quad 2-Input NAND Schmitt Trigger. Actually. I've made a circuit similar to this and it work. But it was for transmitting the US and IR signals at the same time. I modified the schematic and add another MC14093 so I can transmit the two signals in different occassion. Please help me.
It's difficult to say if the oscillator part will work, where are you
gonna find a 40 kHz crystal, or is it some kind of resonator ?
The - 3 dB point of the low-pass filter with the 100 k resistor and
the 50 pF capacitor is only about 32 kHz.
Only one comment, the output to the ultrasonic TX won't be of much
use because these transducers require a substantial amount of drive.
Remove both 220R resistors and replace them with the same drive
circuit driven by the previous "inverter" to form an H-bridge.
If you can't find a 40 kHz crystal you can always replace the
oscillator part with the following "no tune" circuit.
**broken link removed**
on1aag.
The oscillator part will not work because you used a nand gate
with a schmitt-trigger input and this kind of oscillator requires
the gate to operate in linear mode !
A 4011 will be a better choice for the oscillator part.
@on1aag: Thanks for your comment. I already tried a similar circuit. The same oscillator part and the same IR and US transmitter part. The only difference is the part to trigger the US and IR, where I only have one 2-input nand schmitt trigger connected to one pin for transmitting the two signals at the same time. And it work. Here's the previous schematic design.
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