The PT2399 echo/delay IC (integrated circuit) on a 16-pin DIP with a minimum of external components required. Delay time set by external resistance.
PLEASE NOTE: Easily susceptible to heat damage. If you must solder directly, always use a heat sink. Ideally, you should use these with sockets.
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These work well for me and have low noise. There are some knock-off parts out there, but these appear to be real parts from the Princeton factory. Just hope they get more of them because I'll buy em!
Works as expected. Fast delivery.