| Electronics > Beginners |
| Ultrasonic transducers. |
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| CJay:
Not so much a beginner's question but one from way back in the mists... I seem to remember reading that although ultrasonic transducer pairs were marked T and R that they are exactly the same thing? Am I right or is my mind playing tricks on me? |
| Benta:
Not sure about the T and R, but I do remember that they were matched and sold in pairs. |
| McBryce:
I think there are/were very minor differences between the physical and electrical properties of the T and R devices that were sold in pairs, but that they were essentially the same device. Probably sold in pairs because they were tuned to the same centre frequency. I know that modern automobile parkaid systems only use one device to transmit and recieve the signal, so the T and R devices must have been extremely similar. McBryce. |
| Gyro:
As the T/R indication is usually either a stick-on label or ink stamp, I suspect it's more of a 'selection' process. Maybe they keep the lower impedance ones for TX. The internal construction looks identical, same little metal cone. They both seem to work ok in bat detectors. |
| CJay:
--- Quote from: Gyro on June 05, 2018, 02:35:37 pm ---As the T/R indication is usually either a stick-on label or ink stamp, I suspect it's more of a 'selection' process. Maybe they keep the lower impedance ones for TX. The internal construction looks identical, same little metal cone. They both seem to work ok in bat detectors. --- End quote --- Exactly the application I have in mind, thanks. I've ordered a couple of pairs of 40KHz ones. |
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