HOAG INSTRUMENTS with Optical pickups  PHONE 503-625-4044  mailto:ronhoag@juno.com
 PATENT INFORMATION          RON HOAG        P.O. BOX 3053        NEWBERG, OR 97132

1971 NAMM SHOW PICKUP  1977 musician guide  molalla pioneer 

THIS WEB SITE WILL END ON JUNE 2, 2008

REGARDING MY OPTICAL PICKUP :

 EACH PICKUP IS  INDEPENDENT  AND CAN BE USED ON ANY TYPE OF STRINGED

 INSTRUMENT.  THIS  IS MY 1970 LIGHT PIPE PICKUP FOR: VIOLIN, CELLO, ACOUSTIC GUITAR ETC.

  SOUND FILES BELOW

    

  

custom installation on my personal guitar. I covered the pickup cavities with black plastic and installed my optical pickup at the bridge.

THE STEREO JACK HAD BEEN MY STANDARD SINCE 1969 NAMM.  AN INLINE FORM  WAS USED AT THE 1971 CHICAGO NAMM AND AT THE 2001 SUMMER NAMM

     

THIS IS MY 1970 CIRCUIT. THIS IS VERY SIMPLE AND INEXPENSIVE TO MAKE. THE NEW DESIGN HAS LEDs, NOT LIGHT BULBS. THE CIRCUIT AND SOUND ARE THE SAME, MY SOUND FILES ARE BELOW. EACH COMPANY MAY ADAPT THE CASE STYLE TO THEIR OWN INSTRUMENTS.

THE INDUCTOR IS HIGH IMPEDANCE AND WILL DEVELOP THE "MAGNETIC SNAP", THAT MAGNETIC PICKUPS GIVE AS IT DISCHARGES THE COIL. THE CIRCUIT THAT FOLLOWS THE CAPACITOR 94, IS REPRESENTATIVE OF THE AUDIO AMPLIFIER. THE PICKUP CIRCUIT HAS NO ACTIVE DEVICES OTHER THAN THE PHOTO DEVICES. THE OUTPUT VOLTAGE IS CONTROLLED BY THE AMOUNT OF LIGHT RADIATION FROM THE LEDs, MORE RADIATION THE MORE VOLTAGE OUTPUT. THIS CIRCUIT HAS 3 TO 5 VOLTS OUTPUT. HIGHER OUTPUT CAN BE OBTAINED AND CAN REACH TO 30 VOLTS OUTPUT. NEW AMPLIFIER DESIGNS CAN TAKE ADVANTAGE OF THIS HIGHER VOLTAGE.

Fast response time is the key word here. Magnetic pickups, that started the midi guitar evaluation, has given us a challenge to improve the midi response time. Other mechanical pickups have been used, but they have difficulty in the lower frequency of the vibrating strings. Response time, The time for the midi trigger circuits to latch onto the fundamental of each string, is critical for any midi interface.  This has been limited by many factors within each pickup. Every trigger circuit relies on the signal fed into it to be the fundamental frequency. If not, it has to filter out the string harmonics to do that. Hoag Optical Pickup generates the fundamental first and then the harmonics follow.

Hoag Optical Pickups also, greatly expands the frequency of the pickup. The Hoag Optical Pickup is responsive from a few Hertz to well over Human hearing and is quite evident in the sound files below.
Blues on HOAG LB.mp3   K-MAX-MIDI-BASS-SAMPLE-2.mp3    Midi dance by Ron Hoag.mp3    Optical Pickup Bass and Guitars.mp3   Midi guitar major or 7.mp3

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