> On May 19, 2020, at 10:02 AM, gregebert <[email protected]> wrote: > > Laser-trimming of resistors was once common for precision analog parts; I > think it's been largely replaced with fuses.
In the mid-Eighties PAiA electronics had an embedded micro-controller for their analog modular synthesizer. Most synths use linear control voltages and modules such as VCOs have on-board exponential converters to control the pitch of a linear VCO. To save money PAiA used exponential control voltages (Volt/Hz) and linear VCOs. The DAC for the MCU was laser-trimmed to make the output perfectly exponential. Terry Bowman, KA4HJH "The Mac Doctor" "I've seen things you people wouldn't believe: attack ships on fire off the shoulder of Orion... beams...in the dark in the Tannhauser Gate. All those moments will be lost in time...like tears in the rain." — Roy Batty, Blade Runner -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/47382C24-D116-4507-AEEA-F6EC09C5854E%40gmail.com.
