Pins 1 and 7 of the LFO. You can check the frequency of the square. Try changing the rate potentiometer to see what is the frequency range of the LFO.
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Show posts MenuQuoteAre the solder brides on the ISD chip the jumpers on the tagboard layout?Yes, the ISD I used is the ISD2560, and it has several pins that are connecter together. Since I used the SMD version, it all got together in a big lump of solder.
QuoteI always meant to get back to this one. I remember I had come up with an idea to do sound on sound / layering. Just never got around to doing anything with it.I tried something like that when messing with the ISD1720. Unfortunately it had a beep every time the recording restarted. It would require way more switches, though.
QuoteThat's etched, yeah?Yes! And filled with black paint, so that it gives a good contrast.
QuoteHey Thomas, can you refresh my memory on the loophole?The loophole follows the same concept of zvex's LoFi loop, using a different answering machine IC.
Quote1) there is a missing resistor (68K) between pin 5 and 6 of the NE570, and the other two resistors (R9/R10) have a lower value (47K instead of 68K). Also, on the second half of the NE570, the two resistors R17/R18 have higher value compared to the others schematic.I read somewhere that the described changes were done because of the supply voltage, and not polarity. MN3005 chips work nice at 18V, MN3205 only work up to 9V. The MN3005 also works at 9v, where there is lower headroom. Some resistors were changed to reduce the gain of the NE570, so that it will not hit the BBD as hard. The missing resistor is likely also related to this change. If you check the DirtBag discussions there was also an additional capacitor to filter some signal and improve the sound when using the MN3205.