SBL 1 Mixer

Posted: 9/25/2016 12:17:57 AM
Fat Bob

From: Florida

Joined: 9/3/2016

So I'm in the middle of an EW build and wonder if anyone has ever tried a SBL-1 Mixer instead of the single diode one?

EW with SBL1

Posted: 9/25/2016 12:26:21 AM
Fat Bob

From: Florida

Joined: 9/3/2016

Here's my build. There's a nice spot for the SBL-1 in the middle there...

New EW

Posted: 9/25/2016 11:18:25 PM
Fat Bob

From: Florida

Joined: 9/3/2016

So here's what I came up with. We have to chop the 24V waves down to 1.4V and 0.7V for the SBL-1

then boost the 0.25V output up to 0.8V like the original EW.

Layout

Schematic

Posted: 9/27/2016 10:32:47 PM
Fat Bob

From: Florida

Joined: 9/3/2016

I also found some 8038 pcb's on Ebay for $2.27 delivered!

8038 for $2.27

They look like this;

8038

You could use these to add some LFO type things. One set to a faster freq

could modulate the pitch oscillator trim for FM stuff. Another set to 0 -20 hz

or so could modulate on 2 on the 13700 which changes the pulse width. Another

could sum with the VCA output for amplitude varitions. They would need some 

buffering and pots to tune amplitude but could be added like this;

EW 8038

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