74HC595, boldport, datasheets, electronics podcast, H11L1M, MacroAmp, MacroFab, macrofab engineering podcast, MCP23S08, MICROPHONIC, PinoTaur, Super Micro, TT Electronics
Podcast
170

MEP EP #170: Start Getting Crusty

Podcast Notes

Parker

  • PinoTaur
    • MCP23S08
    • I/O Expanders Verse Shift Registers?
  • Wagon Tach Project
    • 3D printed the housing
    • Need to run the wire from the distributor to inside the cab
    • To knock down the distributor signal
      • In series diode to prevent negative flyback? voltage from affecting circuit
      • Resistor divider
      • Zener diode to clamp to 4.7V
      • H11L1M – Schmitt Trigger Opto

Stephen

  • MacroAmp Testing
    • Used a variac to bring the amp up to voltage
    • Found some of the resistances were too high
      • It can be difficult to determine what a transformer tap will produce – I chose to guesstimate and fix it later…it works
    • Higher gain when powered from the transformer. About 100x gain
    • Tested into a Power amp – Works
    • HUGE ISSUE: MICROPHONIC TUBES
    • Next steps – Get everything in the enclosure. Wire the output transformers

R.F.O.

Visit our Public Slack Channel and join the conversation in between episodes!


The MacroAmp being tested off of the transformers. What is plugged into the Variac!

The MacroAmp being tested off of the transformers. What is plugged into the Variac!


Special thanks to whixr over at Tymkrs for the intro and outro!