I've been working on a guitar effects pedal based around the rare and coveted Ampeg Scrambler. I used almost all the original components specified in the schematic and integrated a simple polarity protection for the DC jack. The biggest enhancement I've added is a sort of vibrato effect as an optional modifier to the texture control. I find the effect quite interesting, but I have a hunch there's a simpler way to achieve it. Currently, I have a timer circuit driving a makeshift vactrol (LED taped to photoresitor). The main circuit's texture control is then fed through the vactrol's variable resistance. I'm concerned that driving the vactrol's LED and 555 timer in addition to the rest of the pedal will create an impractical strain on battery life. Hmm, I should probably measure the circuit's current consumption to learn more. More to come.
Looks good! 1st comment but been snooping for a while. For battery life, the 7555 cmos equivalent draws a lot less power and is a direct replacement for the 555. Low current LED should also help. Looking forward to the samples!! Joel
Aah, 7555, thanks!