Analog Synth

The biggest electronic project I ever did. Actually, I started in 1980 but couldn't make the pcbs then. Retried in 2000, and this time I didn't give up... There will be detailed descriptions and schematics of the modules as soon as I have the time.
	#1 The beginning. I'd like to add an article about the making of PCBs... (some day)
#2 The basic rack and the power supply.
	#3 Rear view. You can see the transformer, the master volume pot, mute switch and the headphone jack.
#4 From now on you can call it a synth: In/Out panel, oscillator #1, test keyboard; the module in front is an ADSR envelope plus a exponential VCA.
	#5 Same as above with the ADSR/VCA built in and a beautiful red trigger switch in front.
#6 The filter. On the right side of the board you can see the famous transistor ladder (thank you, B.M.!), on the left there is another ADSR.
	#7 The filter is in. But will it work?
#8 My workbench. Just testing the filter module.
	#9 Basic synth with 1 oscillator, 1 filter, 1 VCA and two envelopes.
#10 Rear view, with connections to the patch bay.
	#11 Oscillator #2
#12 The mixer and the ring modulator, plus an envelope follower for the external input.
	#13 Growing. Still some space in there.
#14 Different point of view.
	#15 Needs a bigger power supply. The 3 oscillator chip heatings are eating all the current.
#16 The bigger transformer causes hum in the VCA. Built an external power supply.
	#17 What to do with the empty space: Two separate 4-stage frequency dividers and fixed filter banks, two additional LFOs and linear VCAs.
#18 Front view of upper rack. 70's organ switches for frequency dividers and fixed filters.
	#19 OK. I did my best to put in as much as possible.
#20 Ta-dah!
	#21 Nice photo for the brochure, huh?
accessories Indispensable needful things.
	accessories More I.N.T. Also see The Moog Archives (menu "Oddities")