Clock

Technically a clock is just an oscillator - usually one that produces a pulse wave, generally at subsonic frequencies. It is commonly used to provide a timer for triggering envelopes, Sample & hold or sequencing modules. Some clock sources will go to low frequency audio or even higher rates, allowing them to be used as a sync or reset source for audio oscillators, LFOs and cycling modules.

Feel free to add to this list. See also: Modules by Function

Euro

Manufacturer	Module	Width	Power	Comment	Product Page
Flame	Clockwork	28hp	?mA, requires 5V,		Clockwork
Future Sound Systems	FSS DC1			Decade Counter

5U

Manufacturer	Module	Width	Power	Comment	Product Page
modcan	Clock 43b	1.75"			http://www.modcan.com/bseries/modulesb.html

Frac

Manufacturer	Module	Width	Power	Comment	Product Page