octave or interval switch for any VCO
2000-09-02 by J. Larry Hendry
Earlier this year, I made several posts to the MOTM list regarding a simple module I have built on MOTM protoboard. The function of the module is simple. It has CV in and CV out. Your 1 volt/oct control voltage goes to the IN jack and CV out connects to your oscillator (MOTM or any 1 volt/oct osc). This module has rotary style switches that let you dial in preset intervals or switch your oscillators up and down by fixed oscillators. This is a function not implemented on the MOTM-300 There are two versions of this module. Version # 1 has 3 rotary switches that will shift up or down 5 positions. The normalling is such that you can use one CV in for all shifters. Or, you can use 3 in and 3 out. So, at the touch of a shitch you can shift any oscillator to a third above, one to a 5th, and one to a dominant 7th or 4th or ?? The 5 shifts up and down are selectable by the user at the time of construction. Version # 2 has only 2 channels of shift, but has 4 knobs. One switch for each channel selects only octaves up and down. The other switch has all 11 semintones of shift within the octave (user tune-able). So, you have any interval you want times-two. I have version # 1 built and working fine. Version # 2 is laid out on protoboard and documented but not built. However, the circuitry is the same, so it will work as well as version # 1. Some of you expressed interest in these when I first finished the design. I sent some of you copies of the protoboard layout and schematics. Well, the time has come to decide if you want to build one of either of these and have a nice MOTM style 1U panel. We are about to cut the screen to make the panels IF there are still a few interested. It will be a standard MOTM 1U panel. The blank will be an official MOTM panel purchased from Paul. It is designed with standard MOTM spacing and layout. Unless I have a few interested, no screen will be cut for either of these modules. So, I NEED TO HEAR from you if you want to build this puppy. Notice I am not selling anything. I am sharing a complete and 100% functional design that uses regular MOTM protoboard available from Paul and commonly available parts. In fact, I even have a list of the part numbers from the catalogs I purchased the parts from. So, e-mail me if you want want to buy a 1U screened panel for this module. We are only going to make a set number for those who have promised to buy the panel. This is a one time deal. You are either in now or probably not again unless you want to order ONE panel later and pay the entire set up fee yourself. By buying now, the set up fee is spread across all who what one. When you e-mail me your intrerest, I can send you a copy of the front panel design (THANK YOU Dave Bradley). And, I have an audio MP3 file that demonstrates the version # 1 in operation. Larry Hendry P.S. In case you didn't catch this the first time, I am NOT selling these in kits or constructed. But, if you are interested in DIY from a protoboard with all the layout already complete and functional, this could be for you.