Magazine Archive

Home -> Magazines -> Issues -> Articles in this issue -> View

Changing Glide Rate

Another commonly requested timing change is the glide rate of the 2720-9 Glide circuit. Changing the timing in this circuit is much simpler than in the Envelope Generator and is easily changed to suit individual tastes.

In this particular circuit it is best not to increase the resistance (R3 and R4) of the timing circuit for two reasons. First, a potentiometer is more expensive than a capacitor and secondly, an increase in the value of R4 can, in conjunction with the input impedance of the op-amp IC-1, cause a voltage divider which would cause the keyboard tuning to lower as the glide rate control is advanced. Lower glide times can be most easily obtained by increasing the value of timing capacitor C3. Values above 1 mfd. will require that you use an electrolytic capacitor so be sure that these polarized capacitors are installed with the negative load to ground and the positive lead at the conductor which leads to point (H) on the circuit board.

(Click image for higher resolution version)

NEXT ISSUE - More modifications and a Footswitch control for the Glide circuit.

Previous Article in this issue

Modifying Time Constants

Next article in this issue


Polyphony - Copyright: Polyphony Publishing Company


Polyphony - Jun 1975

Donated & scanned by: Retro Synth Ads

Feature by Marvin Jones

Previous article in this issue:

> Modifying Time Constants

Next article in this issue:

> Patches

Help Support The Things You Love

mu:zines is the result of thousands of hours of effort, and will require many thousands more going forward to reach our goals of getting all this content online.

If you value this resource, you can support this project - it really helps!

Donations for November 2020
Issues donated this month: 2

New issues that have been donated or scanned for us this month.

Funds donated this month: £48.00

All donations and support are gratefully appreciated - thank you.

Please Contribute to mu:zines by supplying magazines, scanning or donating funds. Thanks!

Monetary donations go towards site running costs, and the occasional coffee for me if there's anything left over!

Small Print

Terms of usePrivacy