Date: Sat, 4 Feb 1995 12:47:30 -0800 (PST) From: Romeo Fahl To: Analogue Hades Subject: AD533 Ring Modulator OK, several of you expressed interest in the AD533 based Balanced Modulator. Here it is, as published in Electronotes: 25K +15V 25K +15V __/\/\/\__| __/\/\/\__| Y*--------- | ^ | ^ +15V \ -15V |Y -15V / DCo 25K | \ | / __/\/\/\__| \ | / | ^ ------1------10--------9--------- -15V | Xo +15V | | | -----2 8------ | ^ | AD533 | | | 25K / | | GND | -/\/\/\-3 7------------- | / | | | | | -/\/\/\-4 | 7.5K || | / ----------5----------6----------- / | | / -15V | * * OUT X (* indicates a jack) X and Y are the inputs, Out is out of course. All pots are set-and-forget trimmers. Here's the trim procedure: 1. Adjust DC0 for zero volts out with X and Y grounded. 2. Apply +/-5 volts @ 100Hz to Y, ground X, and adjust Xo for minimum AC signal at the output. 3. Apply +/-5 volts @ 100Hz to X, ground Y, and adjust Yo for minimum AC signal at the output. 4. Ground X and Y. Readjust DCo to zero volts if necessary. 5. Apply +5 volts to X and Y at the same time. Adjust Gain Trim for +5 volts output. --------- Happy Skronking! Romeo ----- ms20@aa.net