UA726 substitute for Kobol Expander I (Rev2)

author: Utilities
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2 layer board of 0.67 x 0.50 inches (17.0 x 12.7 mm)
Uploaded: August 26, 2022
Shared: August 26, 2022
Total Price: $1.65

Untested PCB but got very minor changes from Rev1 which tested fine.

Pins 5, 6, 7 and 8 don’t need to be connected.

The two pins on both LM3046 ends are for a 1k 3300ppm PTC (tempco) resistor. It replaces R90/R168 so don’t keep it on the VCO board. It has been tested in LTSpice to well correct the temperature deviation with the exact circuit.

<Schematic image>

<Picture1> <Picture2>

Donate: PayPal.Me

Untested PCB but got very minor changes from Rev1 which tested fine.

Pins 5, 6, 7 and 8 don’t need to be connected.

The two pins on both LM3046 ends are for a 1k 3300ppm PTC (tempco) resistor. It replaces R90/R168 so don’t keep it on the VCO board. It has been tested in LTSpice to well correct the temperature deviation with the exact circuit.

<Schematic image>

<Picture1> <Picture2>

Donate: PayPal.Me

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