Heathkit Gr 1290 Manual Dexterity
All resistors are 1/4 watt, 5% tolerance and all capacitors are in microfarads (uF) unless marked otherwise. Voltages were taken with a 9 Volt supply and a setting with no sound coming from the speaker. The controls were set as follows:. Volume — fully counterclockwise. Pushbutton tune — center of rotation.
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Heathkit Gr-1290
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Discriminate — center of rotation. Audio Tune — center of rotation The original coil that came with the Heathkit project was preassembled at the factory. It had a diameter of around 15cm (6 inch). A larger (30cm, 12inch) coil can be made using the following data: L1 = 300mm diameter, 90 turns,.4mm wire L2 = 140mm diameter, 90 turns,.4mm wire L3 = 130mm diameter, 550 turns,.1mm wire.