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2 x HN3A51F + 1 x IMX8-7-F + 2 x BC846C transistors for the Ultra-LD Mk.4 Power Amplifier module
A pack of three dual transistors and two standard transistors:
2 x HN3A51F dual PNP transistors, 120V, 100mA in an SM6 package
1 x IMX8-7-F dual NPN transistor, 120V, 50mA in a SOT-26 package
2 x BC846C high-gain NPN transistors, 80V, 100mA in an SOT-23 package
These transistors are required to build one Ultra-LD Mk.4 module. They have been discontinued and are now hard to get.
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SA156 plastic bobbin
An SA156 plastic sewing machine bobbin which can be used for winding high-current air-cored inductors in the range of about 1-10µH. 6mm ID, 20mm OD, 10mm height.
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Ultra-LD Mk.4 Amplifier PCB [01107151 RevC]
PCB for the Ultra-LD Mk.4 200W Power Amplifier.
Double-sided PCB with plated through holes, solder mask and silkscreen overlay.
135 x 93mm.
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Ultra-LD Mk3/Mk4 Amplifier Power Supply PCB [01109111]
PCB for the Ultra-LD Mk3 Amplifier Power Supply. Also suits the Ultra-LD Mk4.
PCB with plated through holes, solder mask and silkscreen overlay.
141 x 80mm.
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Ultra-LD Mk.4 Amplifier prototype PCB [01107151 RevB]
Prototype PCB for the Ultra-LD Mk.4 200W Power Amplifier.
This board has been discounted although it's almost identical to the final PCB. You MUST cut the track completely from D6 which runs to the far end of the adjacent 100kΩ resistor. Once the components have been fitted, add a tiny length of wire to join the disconnected pad of D6 to the nearest pad of the adjacent 100kΩ resistor.
Double-sided PCB with plated through holes, solder mask and silkscreen overlay.
135 x 93mm.
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Ultra-LD Mk.3 Power Supply PCB pattern (PDF download) [01109111]
PDF with the PCB design for the Ultra-LD Mk.3 amplifier power supply (single-sided).
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Ultra-LD Mk.4 Amplifier PCB pattern (PDF download) [01107151 RevC]
PDF with the PCB design for the Ultra-LD Mk.4 200W RMS Power Amplifier (double-sided).
Both layers are in a single PDF.
Note that due to the complexity, it is impractical to etch this board yourself. This is provided mainly as a reference.
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