Orb 1

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For best performance, use a 2x18VAC transformer. Minimize the voltage loss to your train layout - use several cables, minimum 0,75mm2. If stationary decoders do not hear the commands, the connection is probably swapped. This simple connection works fine with Rocrail but your computer is not galvanic isolated from the booster as with ORD A three pole screw terminal, J1, accept incoming AC-power. Four diodes, D1-D4, rectifies the voltage. Note about 1x18VAC supply: Only ground and one of the AC input terminals is used, and then only one fuse and two diodes. The circuit then becomes a half-wave rectifier. The smoothing capacitors stores charge between the AC-cycle pulses. With 1x18VAC transformer and half-wave rectifying, there is a half cycle gap between each power pulse and the smoothing capacitors must in this case be very much larger. A comparator with hysteresis is created with the OP-amp U3, input resistor R5, hysteresis resistor R3 and current limiting resistor R The positive half is explained: This is the stabilized output feature of the design. When the voltage over R1 is greater than approx 0,6V transistor Q3 begins to conduct and then limits the base voltage to Q1. This is the current limiting feature of the design. D5 ensures no reverse current can flow from the base of Q3 to collector of Q3. The positive parts of the cycle can only charge through a 10k resistor, R11, and that current is not enough to rise the voltage over the capacitors. R6 limits the current if booster bus pin 5 is inadvertently forced low. D9 make it possible to have several boosters on the bus, each can drive pin 5 high but not sink current from it. High R15 makes Q5 saturate and pulls base resistors nearly to ground through D Then neither Q1 or Q2 conducts and the booster is off. A simple LM design. Use a NTC resistor like for example Vishay Attach the NTC to the heat sink. Fan output voltage table:. See LM data sheet for more information. Optional Fan Power Output. The real stuff, ORB-1 version 1. Use transformer without center tap or, for best performance, with center tap typical 2x18VAC. With 0,5W zener diode, Z3 tends to break due to high inrush current to C1 and C2. Use 1,3W zener or insert a current limiting resistor R in series with Z3. Use 4W types, max 17mm length. With creative mounting and soldering you may use longer types or even bundles of 2W metal film resistors, like 4pcs 1Ohm in parallel for 0. The design is for TO cases but you can use TO too. Several types will do. Use either CC14, 16mm diameter, 7,5mm leg spacing, minimum 35V or C5 and C6, snap in type, max 35mm diameter, 10mm leg spacing, minimum 35V. If you plan to use a transformer without center tap, use largest possible capacitance, minimum 2xuF for 3A output or 2xuF for 5A output. The diodes must sustain full power usage. We recommend 1NX series, like 1N You can also use a more powerful type, like 6A You may use Schottky diodes if you want to minimize the voltage drop over the diodes. Drill 2,5mm holes and thread with a M3 tap. Use nylon screws and insulating washers between TO tabs and the heat sink. Use P3 header to supply power to the CPU fan. Reichelt Elektronik delivers only to Germany. Mount all small components. Several boosters can be daisy chained. Fan output voltage table: Views Article Discussion Show pagesource Old revisions.

Orb 1

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