Month: January 2020

The schematic of DR-110 is: For this circuit, each percussion element seems to sound when you put a negative pulse of width 1 ms. I've put oscilloscope to observe the pulses come as expected. Here are the pulses to the bass drum and output: Blue: Input pulse, Red: Output Blue: Input pulse, Red: Output The pulse width looks to be around 1.3 ms. These are the pulses to the snare drum and output: Blue: Input pulse: Red: Output Blue: Input pulse, Red: Output For the hand clap, I only took pulses: Blue: CP I, Red: CP II This is a simulated output of the bass drum circuit: The output would…

It's been a while since I stopped building things. But it's a new year, I'll try restarting it. For not making things for long, I cannot do anything aggressive yet. I would start with picking up an old DR-110 from my toy box to modify it. This device is half-dead. Upper half of the display is not functioning. Membrane switches are not working well, too. The case is nice looking, so it may be fun to keep it and make it work. But it's an old device and what can be done is pretty limited compared to contemporary feature rich devices. I would go simply with replacing the control by…