Delptronics ThunderBell Analog Cowbell Module The Delptronics ThunderBell is a classic analog cowbell sound. The circuit is inspired by the great cowbell sound in the Korg KR-55. Like the KR-55, the TR-808, and most other analog drum machines, we model a cowbell by using two tuned square waves. We also include some pseudo-ring-modulation, as did the KR-55. Tuneable In the old drum machines, the cowbell was not tuneable. Newer cowbell modules give you knobs to tune the two square waves. However, if the two frequencies are not in correct relationship to one another, then it does not sound like a bell at all. The Delptronics ThunderBell keeps the two waves in the proper relationship across a wide freqency range. So, it is a truly tunable cowbell. There is also some room at the top and bottom extremes where the sound gets weird and fun, if not bell-like. The ThunderBell also gives you control of the decay, so you can create longer bell sounds. Voltage Controllable The ThunderBell gives you voltage control of both the pitch and decay. The CV input is 0 to 5V and covers the whole range of the module's sounds, it is not 1V/octave. We also include a trigger button on the module so you can throw in a bell into your mix whenever the mood strikes you.
