SAD1024 alternatives?

[aankrom]

You guys just need to know what old consumer electronics mitems to buy on eBay super cheap to get these parts. I admit that most of what you can get is MN3007, MN3006 (128 stage - I have a few of these) and R5106.

The R5106 is like half of a SAD1024. It's actually the same thing (basically) as the SAD512D. The 'D' standing for 'driver' I think since the R5106 and SAD512D only need a single phase clock. You could use two to act like a SAD1024. There's a 'sync' pin on them to do such a thing, but I really can't figure out how you use it.

Most flangers that use SAD1024's are using them as parallel 512-stage devices anyways.

AND:

Sometimes you can find LM1894 Dynamic Noise Reduction chips. These are like comandors except that they are single-ended and act like a VCF than a VCA. The single only passes low frequency sound until it detects high frequency material and opens up the bandwidth. They work beautifully at the end of any BBD device. Especially with as touch of compression (not enough to need an expander).

Scrounging is the way to go. Especially when you are motivated by austerity like me. Along with these BBD's in these circuits I find are NJM(JRC)4558DD (yes 2D's) and RC4136's. OK the 4136's are no big deal, but I like them anyway. But lately when I'm picky for a cheapish op-amp I like the TL052ACP...

[MR COFFEE]

Hi stm,

Thanks for reply.

Yes, you may be right regarding the noise specs. Checked again the datasheets and they are not given in the same terms. However the question as to which (SAD1024 or MN3007) has better PRACTICAL noise specs is still open.  I feel that the MN3007 might still be somewhat better than the SAD1024, but probably not by as much as 10dB's as I stated before.

So you haven't measured the MN3007 either. It *is* quite a hassle to set up a decent test. The MN3007 may well be a tad quieter, but I haven't had an easy setup to measure them at a particular Signal\THD+noise where they would be really comparable. The  comparison is further complicated because they both have different gains (the SAD-1024 actually has an amplitude gain, the MN3007 has a loss of several db IIRC, and signal handling capabilities (IIRC, the MN3007 will take a higher input level without overloading than the SAD-1024A).

I agree plenty with the fact that the SAD1024's sound better for flanger. This "something" they have over the MN family might have to do with the better bandwidth which in turn produces deeper notches.

The gain of the MN3007 (well, actually it's a  negative gain or loss, ... but anyway) decreases as you push the clock frequency up above spec, which, along with the bias shift and clock artifacts, means the cancellation of any particular mix of dry and delayed signal varies in depth with the clock frequency along with the notch frequencies. My impression is that this accounts for the better flanging sounds most people perceive in Flangers using Reticon SAD1024As. MN3007 chips have a pretty flat frequency response well beyond 20khz AFAIK when operated at high clock frequencies.

That's why I suggest people try using Panasonic BBDs with less stages if they want to get really short delays out of them instead of pushing the clock frequency way up above spec. They're OK but not top-notch in that application.

Or give it up to Reticon. Too bad the company isn't around in their original incarnation anymore

For chorus, MN3007 are fine. REALLY fine. 

Hi aankrom,
Do you know of ebay stuff where these chips are *socketed*? Please share!