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* Remove jumper between Pin 5 of TL072 nearest the SAW out pads and the 22k "WS TRIM" trimmer. * Jumper pin 5 of the TL072 to "SAW OUT (AC)" pad. ...

...g generator. At the left, there is a comparator based around one half of a TL072. This is there to convert any external clock signal into something suitable | LM358 TL072||align=right|1 ...

...a TL072 if needed. Also there is a 100n between pins 1 and 3 of the LM358/TL072 that can be omitted, especially if you are having problems with the reset f | TL072 (was LM358)||align=right|1 ...

...of several distinct blocks. The first are the input shapers, made from the TL072 and its associated components. These take whatever signal is fed into the m The upper section of the TL072 is used to process the Clock input. The frequency of the clock signal deter ...

...g generator. At the left, there is a comparator based around one half of a TL072. This is there to convert any external clock signal into something suitable ...ively removing it from circuit. The 100k pulldown resistor at pin 3 of the TL072 should be omitted. ...

...e output of the op-amp also reduces. Add a 47pF across pins 1 and 2 of the TL072 if you do this (i.e. between the A and B pads). ...capacitors could be soldered between pins 1 and 2 and pins 6 and 7 of the TL072 should you find the mixer behaves in an unstable manner. This behavior is u ...

...ut of the DC Summer (OU) via a 200k to inverting input of the mixer buffer TL072 (Pin 2) and install every second mixer bus resistor marked RC. These will i ...DC Mixer circuit. The blue line shows where to place a link instead of the TL072.]] ...

TL072 can be used in place of either op-amp. For improved triggering at higher fr | 4558 or TL072||align=right|2 ...

...he diagram and on the PCB overlay, better results will be achieved using a TL072 in its place. | TL072||align=right|2 ...

...d'' (most significant four bits) board. Run a wire from pin 6 of the empty TL072 location on the first board to the ''non-ground'' hole vacated by the remov | TL072||align=right|1 ...

...ty is controlled by the resistor between pins 1 and 2 of the CV processing TL072. The specified 47k resistor reduces sensitivity. In order to get unity gain On the rear of the PCB are four small square pads, near the TL072 at one end of the PCB. These are for two 100n 1206 (or even 805) SMD capaci ...

...above 0 volts, a resistor can be soldered between pin 2 of the associated TL072 and the negative rail. Try a value around 47k to 100k. | TL072||align=right|2 ...

The clock and reset signals are processed by the TL072. The reset is sensitive to rising edges only, meaning that a continuous gat | TL072||align=right|1 ...

...mply replace it with a [[TL072]]. If it is wired between +VE and 0V, Try a TL072, but if that fails consider using [[MC34072]]. ...

| LF353 or TL072||align=right|2 | LM358 or TL072||align=right|1 ...

TL072 "A" processes the incoming trigger and sustain signals. The trigger is conv | TL072||align=right|4 ...

...actually used varied somewhat from build to build. I would recommend using TL072, which appear to be the most stable in the circuit. If you wish to use othe | TL072 (4558)||align=right|4 ...

| TL072||align=right|2 | TL072||align=right|4 ...

| <s>LM358</s>&nbsp;TL072||align=center|1 * Other pin-compatible op-amps (TL072, etc.) should also work on this PCB. ...

...s extremely basic - just a row of standard op-amp summers based around the TL072, in the same configuration as the CGS04 mixer and various other summers use | TL072||align=right|7 ...