9700 MIDI2CV8, VHZ option

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9700 MIDI2CV8, VHZ option

Post by PAiA-Scott »

Hello Martin.

The 9700VHZ option is presently unavailable. It is likely a new converter will be introduced before we go back to the 9700VHZ option. No, it is not necessary to change any parts for the VHZ option operation. It is controlled from within the EPROM Firmware; however it is only activated when the option printed-circuit-board is added. It wouldn't be too difficult to build one on a DIP IC experimenter's board and wire it in as a substitute VHZ option. The schematic and phantom image of the board is in the 9700K manual.

You can scroll down to the second page of the MIDI2CV8 schematic and see the vhz circuit option here:

midi2sch.pdf (application/pdf Object) <http://www.paia.com/prodimages/midi2sch.pdf>

An IC experimenters board like this:
http://www.radioshack.com/products/univ ... 5717555141

...makes it easy to make connections to an IC such as a DIP (dual-inline-package) 4051 as shown on the schematic. It is simply a matter of point-point connecting the parts as they are shown connecting on the schematic. Then, this board can be mounted to a MIDI2CV8 board similar to the way the vhz option board is, with hardware to space it up and over the main board, piggy-backed, with wires from the main board to this 'daughter' board. These wires are the jumpers I mentioned. It really isn't practical to have the option switch selectable since there are so many jumpers/wires between the two that would need to be opened/closed, and, there are parts installed or not and resistor values selected if the option is in place (this is the reason the rack-chassis is made to accommodate two MIDI2CV8 kits--one can be linear, v/oct and the other, exponential, v/hz).

If you decide to go with the MIDI2CV8 and constructing the vhz option, please don't hesitate to get back to me with any questions you might have.

As an aside, if you need only a single set of control signals for a volt/hz device, FatMan features this type of output from MIDI sent to it--and is an analog synthesizer too.

The 9700FRM or 9700RCK accessory items for an FR7 chassis module or a 19" rack-mount chassis are the ones that include a US-type 120vac to 12vac wall-mount transformer. There is an international version for the module accessory (9700FRMP), but not the rack chassis accessory. If you would like to get the rack chassis accessory, 9700RCK less the US-type transformer, let me know and I can send you a discount coupon that can be used on the website shopping cart credit card order entry (paypal orders must be discounted after the order is completed).


If you are only interested in the 9700K kit item for the MIDI2CV8 (circuit board, parts, wire, manual, etc) and not the panel or chassis accessories, then there is not a concern about ordering less the US-type power supply.

Our online shopping cart will calculate the shipping and handling amounts for the items placed in the cart for credit card orders. Just go through the steps and just before you are prompted for the credit card details, the cart will show the item and delivery amounts. You may then proceed with the order and pay using credit card, or copy the information and send an order through the mail or via fax, or, back out of this screen and checkout using PayPal.

Packages are sent via Priority Mail, International with transit time of about three weeks, including time with customs. We must put the merchandise value on the customs forms and the contents are listed as "Electronic Hobby Kit". I don't have an idea of possible customs fees or duty that might be imposed at your end, but the officials at your end might be able to give you an idea. Our contents description is one that gets the most reasonable results.

When shopping for a 12vac wall mount transformer, note any connector on the end of the part is not a concern as the instructions are to clip and solder the wires direct. Emphasize that you need ac output voltage on the device as dc output types are more common.

Thank you.
Sincerely, Scott Lee

Martin wrote:
> hi, i was looking at the info about the midi to cv converter and i would like to know if i have to change the chip in order to use it in v/hz? or it's just the settings with the dip switches? i looked at the pdf file but did not found much info.
> thanks alot
> martin
> HEAR ME/MA MUSIQUE <http://www.myspace.com/novielo> HEAR MORE MUSIC/ENCORE PLUS DE MUSIQUE <http://novielo.bandcamp.mu/>
Scott Lee