IC ID for Phoenix HElp?

[silverfox0786]

Hey guys

does anyone know what IC49 is on a phoenix

im really strugling to read the manual as its really blurry

thanks

 

[GameOn]

Should be the MN6221AA, doorbell melody tone generator (or a 2716 if you are looking at the otherside)

 

[silverfox0786]

damn just as i feared very hard to come by these melody chips

i have seen people use off the shelf parts, riser boards, does anyone have scheamtics for this
silverfox07862015-10-09 17:09:34

 

[Del Griffith]

A little on the pricey side these Sarj! How bad you wanna fix it

http://www.ebay.co.uk/itm/MN6221AA-INTEGRATED-CIRCUIT-DIP-18-/201416316953?hash=item2ee5591819

http://www.ebay.co.uk/itm/MN6221AA-Integrated-Circuit-/171870590841?hash=item2804491779

 

[silverfox0786]

Cheers Baz

yes i saw those and have saved them on my watch list

 

[PaulSwan]

There is a riser board replacement version with a Hitachi equivalent music player on it with the same music tracks (seen on a few bootlegs). There are several version of both parts (differing in the last couple of letters) that play different music tracks. I have one that plays Greensleaves as the second music track.
Paul.

PaulSwan2015-10-09 18:21:57

 

[PaulSwan]

Found a pic - Hitachi 7910CG and I have seen this alternative on both Taito & Zaccaria editions of Phoenix.

Paul.

 

[silverfox0786]

cool i dont suppose you have schematics for these

i found an old thread on DLF as well where you mentioned this and of another version i can make out the schematics quite easily but teh transistor i cant read properly

 

[PaulSwan]

No, I don't have schems for the riser but the datasheet is online - it's not Hitachi it seems it's Epson made - and the riser is single sided thus easy to figure out.

http://www.datasheetarchive.com/7910-datasheet.html

Do you have a source for the 7910 IC?
Paul.
PaulSwan2015-10-09 18:58:35

 

[GameOn]

Looks like a (2S)C945C a NPN bipolar transistor.

Although the Epson 79xx series sound chips seem harder to source then the MN6221AAs

 

[silverfox0786]

yes i have the single sided EPSON schematics now here but its that transistor i cant read what it is

yes i do have a source for 7910CG chips

 

[silverfox0786]

ok i need to know those Ressitor values other wise i have a prototype riser pcb ready for it

 

[PaulSwan]

That looks different than the riser that's on that Taito board I posted up earlier - the Taito one looks to have more on it and seems more consistent with the Epson datasheet.

The Zaccaria riser looks the same as the one you posted.

Are the 7910 you've found bulk and cheap?

Paul.

 

[silverfox0786]

i shall look into teh taito one, is it a like for like copy of the drawing in teh daatsheet or are there any differences to make it work with Phoenix PCB

they are not cheap in IC price comparision but work out at about £1.50 each chip,which is pretty good as many other places are around £6 each.

 

[RSwanson]

Ideally make the VCC and GND traces larger.
According to the datasheet, the max input is 5v, but the normal input is max 2v, which would explain the numerous resistors in PaulSwan's picture.
I'd be pretty worried running it off 5v.
It looks like you'd have to use potential dividers on all the inputs, it's there not a more appropriate IC available?
Ron

 

[silverfox0786]

i usually make the traces thicker on the VCC and VSS lines. im not finished with it just yet as i need to do the sink screen layer yet and tweek the thicknesses, which i do last

 

[PaulSwan]

The MN6221 datasheet shows similar electrics, max Vdd for that is +4V so it's likely already accounted for on the main board.
The question to ask is "Which sounds better?". IIRC they don't sound exactly the same...
Paul.

 

[philmurr]

I've a few untested NOS MN6221AA's available, say £5 plus post?

Not sure of the manufacturer, not a logo I've seen before

 

[silverfox0786]

oh yes please

ill take 2 if yiou can spare 2

 

[philmurr]

oh yes please

ill take 2 if yiou can spare 2

Ok will PM you now, still have 5 available if anyone else is interested.