Is the MN3205 a pin for pin substitute of the MN3005?

[nordine]

Have tried getting some info about the matter but its not very clear. MN3205 datasheet sample circuit puts pin 1 as VDD and pin 5 as GND, but the Ibanez AD9 schematic (same chip) states the inverse (1 to GND, 5 to VDD). There was a BOSS DM-2 schem i found in this forum that uses the MN3005 and (supposedly) it could be run fine with a MN3205, so i tried it and the chip got super hot  . Then tried again (different chip, that one probably died) with inverted power supply for pins 1 and 5 and nothing happened. So whats the deal?

[bean]

It's not an exact pin sub: VDD and GND are the opposite on an MN3205 from the MN3005 and the resistor(s) from the two outputs switches to pulldown (to GND) instead of pull-up (to VDD).

MN3205 - pin1 is ground, pin5 is VDD, output resistor(s) are grounded.
MN3005 - pin1 is VDD, pin5 is ground, output resistor(s) are pull-up.

This is assuming you are using +DC voltage supply, of course.

[nordine]

Yeah, did that too, pulled both 100k resistors that go before the null trim to ground. High pitch whine from the 3101 sounded louder, but nothing else. Yes, im using DC.

How to test if the 3101? And the MN3205? Maybe theyre wack, got them from ebay.

[DrAlx]

Use MN3102 to drive MN320x series.
Use MN3101 to drive MN300x series.

[bean]

MN3102 will provide the correct VGG voltage to pin8 of the MN3205 without any need for modification.
If you use an MN3101 with the MN3205, you need to approximate VGG (14/15 VDD) with a 1n914 diode from pin1 of the MN3101 to pin8 of the MN3101.

[bean]

To put a finer point on it - if VDD is 9v
MN3005 - VGG should be about 0.6v (1/15 VDD).
MN3205 - VGG should be about 8.4v (14/15 VDD).

[allesz]

Last year I did some experiments with the coolaudio mn3205 and my answer is: Yes, naver give tha chip full 9v.
Keep us updated about you experiences.

[armdnrdy]

Without addressing every detail of previous posts....No...these two BBD ICs are not pin for pin compatible.

To swap out the MN32XX series in a circuit designed for the MN30XX series...you need to modify the circuit.

If you are building a delay from scratch....and want to use the more easily sourced, and less expensive 3205 IC...then it is probably best to locate (they are out there) a suitable circuit that was designed for the lower voltage MN32XX series.

You found out the result of plugging the low voltage IC into the 3005 circuit. 

[Mark Hammer]

Let us now bow our heads in prayer and gratitude that there is only ONE kind and polarity of PT2399. 

[nordine]

MN3102 will provide the correct VGG voltage to pin8 of the MN3205 without any need for modification.
If you use an MN3101 with the MN3205, you need to approximate VGG (14/15 VDD) with a 1n914 diode from pin1 of the MN3101 to pin8 of the MN3101.

alright, will try that and report how it went, cheers

[nordine]

pin 8 of mn3205 now reads 7.4V. still no sound out of the chip.