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Circuit for DC to DC Convertor.
Mooimooi, et. al. I've worked boats most of my life. On a boat, alternating current is considered a luxury. As the sea is a harsh mistress, you may want a more robust charger. Lots of companies make off-the-shelf DC-DC converters of the type previously mentioned, as well as AC switchers...- Warpdrive
- Post #4
- Forum: Circuit design
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MCU 30 Volt INTERFACE
Torque, Your discrete solution probably looks like this (x8) -- Tap the 12-30V line into a low wattage resistor (1/8 W, 16 Kohm or larger is fine), placing its output on the cathode of a 3V zener diode, with the zener's anode to ground. The zener diode will regulate its cathode to its...- Warpdrive
- Post #4
- Forum: Circuit design
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Magnetic Isolation Between Transformers
Nbucska, I concur with your design assessment. I've been trying to teach the core designers (not me!!) and their contracting agents the virtues of optical data links for that reason, but they don't want to listen. They even claim to have their design (as is) working. Closed cores and toroids...- Warpdrive
- Post #6
- Forum: Circuit design
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Magnetic Isolation Between Transformers
>> What is their freq. ranges and core shapes ? >> What kind of circuit uses them ? Power operates in the tens of KHz. Data operates in the hundreds of KHz. Both signals are differential. Core shapes are cylindrical, non-toroid -- like a choke. The power is larger than the data. Spacer is...- Warpdrive
- Post #3
- Forum: Circuit design
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Magnetic Isolation Between Transformers
Greetings, everyone. Usually I give many answers in this forum; now I have a question a magnetics designer would enjoy. I have two transformers that must mount in close proximity to each other, with their respective B-fields dictating an unacceptable amount of mutual inductance between them --...- Warpdrive
- Thread
- Replies: 7
- Forum: Circuit design
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how to quote an in-circuit test
Dear tonih, A quote for test depends on what kind of test. The amount of capital equipment (i.e., overhead), level of automation and labor involved performing the test determines the fee charged. The most prominent digital in-circuit test these days is JTAG (Joint Test Action Group) boundary...- Warpdrive
- Post #2
- Forum: Circuit design
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Inductive power transfer design
Dangerous Dan, There are lots of books you can consult on electromechanical energy conversion. Most of these have practical applications heavily reliant upon inductive energy transfer. Books on transformer design may also help, since that is essentially what you are designing. If all else...- Warpdrive
- Post #2
- Forum: Circuit design
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555 timer to vary the pulse with
bavariamotors, What you're looking for is a pulse width modulator. This can be achieved by configuring the 555 as a "one shot" monostable circuit with the reset node driven by the signal you want modulated. If a phase lock on the incoming signal is desired, adding a 2-input NAND...- Warpdrive
- Post #2
- Forum: Circuit design
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Who makes Low Profile Transformers?
Who knows where I can find a 4:1 step down transformer that can fit on a single-slot VME 6U board (H<0.5")? I've already checked Prem, Cooper Ind., and a couple other producers, and would prefer to buy off-the-shelf instead of a custom bobbin. Ideas welcome, preferably with hyperlinks...- Warpdrive
- Thread
- Replies: 2
- Forum: Circuit design
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overvoltage protection
April, et.al., Solid State Relays are essentially FETs sometimes combined with optoisolators. These methods of overvoltage protection are most useful in battery chargers, yet tend to be more complicated in their implementation. The Linear Technology data sheets on the LT1510 and its related...- Warpdrive
- Post #8
- Forum: Circuit design
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Please tell me the Pcb layers sequence?
Steve, Your question... > I'm interested in how vibration causes shorts near the outside layers but > not on the deep inside ones. Could you explain this further? ... has a simple yet not-so-obvious answer. A defense contractor's (high density BGA) board I recently put through the shakes...- Warpdrive
- Post #5
- Forum: Circuit design
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New to surface mount PCB's
Everyone, Thanks to stelleb for the insights on JTAG boundary scan testing. However, be advised that while JTAG boundary scan test equipment is highly useful it can become pricey. I'm receiving quotes starting at $15K and going up for the JTAG BST system I'm seeking to implement. Stelleb is...- Warpdrive
- Post #9
- Forum: Circuit design
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Please tell me the Pcb layers sequence?
Ay001, Usually in a multilayer design, it's best to place VCC and GND planes where they have the least likelihood of being damaged. For me, that means the interior layers (3-6). Though some design have no issue with durability, I caution against placing plane layers near the top or bottom...- Warpdrive
- Post #3
- Forum: Circuit design
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New to surface mount PCB's
Steve, Some of the best reference data for pad sizes and clearances is to be found in the manufacturer data sheets for the parts specified in your design(s). These often have layout cell footprints typical of the packages surface mount parts come in. Some general tips... 1. Advantage...- Warpdrive
- Post #3
- Forum: Circuit design
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555 Timer Trouble
I assume you want an astable (free oscillating) 555 circuit. If so, the best astable 555 design is found on the Texas Instruments' 555 data sheet (see www.ti.com and search for '555')... After reviewing the TI design, you should understand that Rb should be less than Ra for the 555 to...- Warpdrive
- Post #4
- Forum: Circuit design
