mdz

we´re looking forward to host another two leaf-audio DIY workshop evenings in autumn. FUZZ-O-MAT and the meanwhile legendary BUMSSS are on the list.
register yourself at leaf-audio.com/workshops_en_1_.html from end of july, but we´ll remind you in fall for sure ;)

why would someone drop a 909 to the floor while it´s running?
i got no idea either, but recently it happened to a friend. his TR threw a few sparks before the main fuse of his studio blew and gone was the bumm-bumm :(

not to rain on roland´s designing skills (and given the fact usually you don´t throw a 909 on the floor) but the position of the original PSU board is somehow dangerous for flying 909s; since the AC solder pads directly face the bottom plate any impact in that area possibly short-circuits the main AC power. you better put some cardboard or isolating rubber between the PSU board and the bottom plate - well, it´s best not to throw 909s on the floor too ;)

unfortunatelly in our case the the shorted AC line was led to the voiceboard PCB through the metal battery compartment, blasting a few semiconductors and GND traces there. see the picture for details (note the PSU has been exchanged on the image already):

certainly the main transformer was blown after this accident. as the 909 had to be returned into its productivity environment asap (sic!) there was no time to organize a suitable transformer so i had to exchange the PSU completely…
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19-ZOLL STAMMTISCH proudly presents:

themed like anyone can solder we want you to build one, two, many lunchboxsoundbins!

leaf audio is offering synth building workshops in cooperation with the synthesizer manufacturer curetronic aiming both, the absolute brazing newbie and old soldering hands (only requirement is to bring your soldering iron, you get that for cheap at the hardwarestore).

everyone will be happy about the cute little tupper ware that comes with a decent sound ;)
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how could one do techno without sample&hold?

resistors are futile, all you need is a dual op-amp and a capacitor. feed in any control voltage and freeze to hold a sample. sorry you midi-folks, this trick isn´t made for you ;)

when adding a control dial to some device sometimes it is more challenging how to mount the new pot than the electronic intervention itself. there’s either not enough space on the control surface or drilling a hole would be the bitch; at the best it’s all just about connecting a potentiometer to an existing footpedal jack. a simple external solution might be using a film roll container:

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