The things you do to amuse yourself during lockdown! Crashing around on Aliexpress, I noted that the peddlers of inexpensive piezoelectric crystals clearly don't understand how we, as buyers, look for them. More often than not, one has to hover over the item to view the extended description to find that vital bit of of information - the frequency! In way too many cases, even that is insufficient, and it is necessary to drill down right into the item. No wonder their "numbers sold" stats are so dismal! I took it upon myself to catalog all the unique frequencies available, below. Inside Aliexpress, enquire on ANYTHING. Click on the store info at the top, and it will become obvious how to hack the URL for a different store. Within that new store, enquire "In this store only" by frequency to see if they still have any. Most rocks have multiple vendors, so shop around to for the best deal "including postage".
| FREQ – KHZ | CASE | STORE NUMBER |
| 32.0 | CYLINDER | 1920050 |
| 32.8 | HC-49 | 2444008 |
| 36.9 | HC-49 | 5744248 |
| 38.0 | CYLINDER | 1960419 |
| 38.4 | CYLINDER | 624531 |
| 40.0 | CYLINDER | 624531 |
| 51.2 | CYLINDER | 1280322 |
| 60.0 | CYLINDER | 624531 |
| 75.0 | CYLINDER | 624531 |
| 76.8 | CYLINDER | 1666382 |
| 100.0 | CYLINDER | 821060 |
| 153.6 | CYLINDER | 624531 |
| 1000.0 | HC-49 | 316973 |
| 1600.0 | SMD | 1920050 |
| 1843.2 | HC-49 | 624531 |
| 2000.0 | HC-49 | 624531 |
| 2048.0 | HC-49 | 624531 |
| 2457.6 | HC-49 | 624531 |
| 2500.0 | HC-49 | 624531 |
| 3000.0 | HC-49 | 624531 |
| 3072.0 | HC-49 | 624531 |
| 3137.5 | SMD | 3686032 |
| 3200.0 | HC-49 | 624531 |
| 3276.8 | HC-49 | 624531 |
| 3579.5 | HC-49 | 624531 |
| 3600.0 | HC-49 | 624531 |
| 3686.4 | HC-49 | 3686032 |
| 3840.0 | HC-49 | 1920050 |
| 4000.0 | HC-49 | 2444008 |
| 4032.0 | HC-49 | 1920050 |
| 4096.0 | HC-49 | 624531 |
| 4194.0 | HC-49 | 624531 |
| 4195.2 | HC-49 | 624531 |
| 4322.0 | HC-49 | 5744248 |
| 4332.0 | SMD | 437213? |
| 4430.0 | HC-49 | 624531 |
| 4433.6 | SMD | 624531 |
| 4500.0 | HC-49 | 1089303 |
| 4800.0 | HC-49 | 624531 |
| 4897.0 | HC-49 | 5744248 |
| 4906.2 | HC-49 | 1920050 |
| 4915.2 | HC-49 | 1762106 |
| 5000.0 | HC-49 | 624531 |
| 5120.0 | HC-49 | 5744248 |
| 5500.0 | HC-49 | 624531 |
| 5529.6 | HC-49 | 4657016 |
| 6000.0 | SMD | 2444008 |
| 6063.0 | SMD | 5744248 |
| 6144.0 | HC-49 | 624531 |
| 6400.0 | HC-49 | 4657016 |
| 6553.6 | HC-49 | 624531 |
| 6612.8 | HC-49 | 624531 |
| 6745.8 | HC-49 | 624531 |
| 6772.0 | HC-49 | 624531 |
| 7000.0 | HC-49 | 624531 |
| 7159.0 | HC-49 | 1920050 |
| 7200.0 | SMD | 1920050 |
| 7200.0 | HC-49 | 624531 |
| 7372.8 | HC-49 | 4657016 |
| 7500.0 | HC-49 | 624531 |
| 7600.0 | HC-49 | 821060 |
| 7680.0 | HC-49 | 624531 |
| 8000.0 | HC-49 | 2444008 |
| 8042.0 | SMD | 624531 |
| 8192.0 | HC-49 | 624531 |
| 8380.0 | HC-49 | 1920050 |
| 8467.2 | HC-49 | 624531 |
| 8643.6 | HC-49 | 624531 |
| 8664.0 | HC-49 | 1920050 |
| 8867.2 | HC-49 | 1920050 |
| 9000.0 | HC-49 | 624531 |
| 9216.0 | HC-49 | 1920050 |
| 9509.0 | HC-49 | 5744248 |
| 9600.0 | HC-49 | 624531 |
| 9815.6 | HC-49 | 5744248 |
| 9830.4 | HC-49 | 4657016 |
| 9843.7 | HC-49 | 624531 |
| 10000.0 | SMD | 1815642 |
| 10111.0 | HC-49 | 5744248 |
| 10240.0 | HC-49 | 5744248 |
| 10245.0 | HC-49 | 1089303 |
| 10250.0 | HC-49 | 4657016 |
| 10368.0 | HC-49 | 5744248 |
| 10700.0 | HC-49 | 624531 |
| 10738.6 | HC-49 | 624531 |
| 11000.0 | HC-49 | 624531 |
| 11059.2 | SMD | 1815642 |
| 11150.0 | HC-49 | 624531 |
| 11160.0 | HC-49 | 1920050 |
| 11250.0 | HC-49 | 4657016 |
| 11289.6 | HC-49 | 624531 |
| 11520.0 | HC-49 | 5744248 |
| 12000.0 | HC-49 | 1815642 |
| 12288.0 | CYLINDER | 624531 |
| 12500.0 | SMD | 1920050 |
| 12800.0 | CYLINDER | 624531 |
| 13000.0 | HC-49 | 4657016 |
| 13081.0 | SMD | 1920050 |
| 13225.6 | HC-49 | 5744248 |
| 13248.0 | HC-49 | 1920050 |
| 13380.0 | HC-49 | 1920050 |
| 13491.6 | HC-49 | 3686032 |
| 13500.0 | HC-49 | 5744248 |
| 13521.2 | HC-49 | 4657016 |
| 13560.0 | HC-49 | 624531 |
| 13568.7 | CYLINDER | 1920050 |
| 13570.0 | SMD | 3686032 |
| 13572.5 | HC-49 | 1920050 |
| 13573.2 | HC-49 | 5744248 |
| 13575.0 | SMD | 624531 |
| 13824.0 | HC-49 | 5744248 |
| 14000.0 | HC-49 | 1666382 |
| 14318.0 | HC-49 | 624531 |
| 14576.0 | SMD | 1920050 |
| 14725.0 | HC-49 | 5744248 |
| 14745.6 | HC-49 | 5744248 |
| 14800.0 | HC-49 | 1920050 |
| 15000.0 | HC-49 | 511081 |
| 15360.0 | HC-49 | 624531 |
| 16000.0 | SMD | 1815642 |
| 16384.0 | HC-49 | 1920050 |
| 16920.0 | SMD | 624531 |
| 16934.4 | HC-49 | 624531 |
| 17280.0 | HC-49 | 624531 |
| 17664.0 | HC-49 | 5744248 |
| 17734.0 | HC-49 | 624531 |
| 18000.0 | HC-49 | 4657016 |
| 18432.0 | HC-49 | 1089303 |
| 18937.5 | HC-49 | 1762106 |
| 19069.9 | HC-49 | 624531 |
| 19200.0 | HC-49 | 5744248 |
| 19440.0 | HC-49 | 3686032 |
| 19500.0 | SMD | 624531 |
| 19660.8 | HC-49 | 4657016 |
| 19891.2 | HC-49 | 1920050 |
| 20000.0 | HC-49 | 1815642 |
| 20250.0 | SMD | 3686032 |
| 20480.0 | HC-49 | 1762106 |
| 20945.0 | HC-49 | 624531 |
| 20945.0 | CYLINDER | 624531 |
| 21000.0 | HC-49 | 624531 |
| 21245.0 | MD | 1920050 |
| 21250.0 | HC-49 | 624531 |
| 21400.0 | HC-49 | 1920050 |
| 21477.2 | HC-49 | 4657016 |
| 21700.0 | HC-49 | 1920050 |
| 22118.4 | HC-49 | 624531 |
| 22579.0 | HC-49 | 5744248 |
| 24000.0 | HC-49 | 1815642 |
| 24545.0 | CYLINDER | 624531 |
| 24576.0 | HC-49 | 624531 |
| 25000.0 | HC-49 | 1815642 |
| 25322.5 | SMD | 1920050 |
| 25400.0 | SMD | 624531 |
| 26000.0 | HC-49 | 624531 |
| 26590.0 | HC-49 | 1920050 |
| 26601.7 | HC-49 | 624531 |
| 26730.0 | HC-49 | 1920050 |
| 26740.0 | HC-49 | 624531 |
| 27000.0 | HC-49 | 1815642 |
| 27038.0 | HC-49 | 624531 |
| 27045.0 | HC-49 | 4657016 |
| 27055.0 | HC-49 | 5744248 |
| 27095.0 | HC-49 | 624531 |
| 27120.0 | HC-49 | 4657016 |
| 27125.0 | HC-49 | 624531 |
| 27138.2 | SMD | 3686032 |
| 27145.0 | HC-49 | 1762106 |
| 27700.0 | HC-49 | 1920050 |
| 28000.0 | HC-49 | 5744248 |
| 28224.0 | HC-49 | 1920050 |
| 28322.0 | HC-49 | 3686032 |
| 28375.0 | CYLINDER | 624531 |
| 28636.3 | HC-49 | 5744248 |
| 28800.0 | HC-49 | 5744248 |
| 29491.2 | HC-49 | 5744248 |
| 29498.9 | HC-49 | 4657016 |
| 29500.0 | CYLINDER | 624531 |
| 30000.0 | HC-49 | 624531 |
| 30400.0 | HC-49 | 624531 |
| 32000.0 | HC-49 | 1995185 |
| 32256.0 | SMD | 1920050 |
| 32768.0 | HC-49 | 5744248 |
| 33000.0 | HC-49 | 4657016 |
| 33177.6 | HC-49 | 5744248 |
| 33330.0 | smd | 5744248 |
| 33868.8 | HC-49 | ELECTRONICS SALON |
| 35000.0 | HC-49 | 624531 |
| 35328.0 | HC-49 | 624531 |
| 35468.9 | HC-49 | 4657016 |
| 36000.0 | HC-49 | 4657016 |
| 36864.0 | HC-49 | 5744248 |
| 37400.0 | SMD | 624531 |
| 37500.0 | HC-49 | 624531 |
| 37875.0 | HC-49 | 1920050 |
| 38000.0 | HC-49 | 624531 |
| 38400.0 | SMD | 624531 |
| 38900.0 | HC-49 | 624531 |
| 40000.0 | HC-49 | 4657016 |
| 40230.0 | HC-49 | 1920050 |
| 40680.0 | HC-49 | 624531 |
| 40685.0 | HC-49 | 3686032 |
| 41000.0 | SMD | 3686032 |
| 41600.0 | SMD | 624531 |
| 41850.0 | SMD | 624531 |
| 44236.0 | HC-49 | 5744248 |
| 45158.0 | SMD | 624531 |
| 46080.0 | HC-49 | 1920050 |
| 48000.0 | HC-49 | 4657016 |
| 49152.0 | HC-49 | 4657016 |
| 49405.0 | HC-49 | 1920050 |
| 49860.0 | HC-49 | 624531 |
| 50000.0 | HC-49 | 5744248 |
| 52416.0 | SMD | 3686032 |
| 54000.0 | HC-49 | 624531 |
| 64000.0 | HC-49 | 4657016 |
| 75000.0 | HC-49 | 624531 |
| 100000.0 | HC-49 | 624531 |
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