barry
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Yesterday, 20:55Nope. The gate has to be five volts LOWER than the source. How is that going to happen?6 replies | 154 view(s)
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Yesterday, 14:46I still don’t see how this circuit will do anything. In order for the bottom(PMOS) to turn on, its gate voltage has to be lower than its source. ...6 replies | 154 view(s)
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Yesterday, 03:55If you turn that pot all the way to the end, you’ll have 48 volts on the PMOS source. Actually, upon closer examination, that PMOS will NEVER turn...6 replies | 154 view(s)
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20th August 2019, 22:40barry replied to a thread Can someone help me to find out what an unknown PCB is? in Elementary Electronic QuestionsSeriously? Of the millions and millions and millions of electronic products out there, you expect somebody to tell you what that board is? Why? What...1 replies | 98 view(s)
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19th August 2019, 20:24barry replied to a thread Altium - how to map pins to multiple pads? in PCB Routing Schematic Layout software and Simulationi don't see your problem. Pin 7=in; Pin 8= in; Pin 9= in... This is done all the time, e.g., FPGAs which have multiple power and ground pins. ...2 replies | 211 view(s)
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17th August 2019, 19:39Maybe you should tell us what we’re looking at. Maybe you should tell us what your input is. Maybe you should post a schematic.26 replies | 641 view(s)
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17th August 2019, 00:21I pretty much disagree with everything you said. The minimum load resistance IS NOT a function of voltage. It probably has something to do with...7 replies | 284 view(s)
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16th August 2019, 17:16barry replied to a thread How to build overcurrent/overvoltage protection in Service Manuals, Requests, Repair TipsMore information is needed. Voltage? Current? Showing two blocks with lines between them tells us nothing.1 replies | 231 view(s)
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16th August 2019, 17:14Those are two separate specs. There’s nothing that says you can drive 2.5 volts into 4K. It says you can have a minimum load of 4K, but your...7 replies | 284 view(s)
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16th August 2019, 00:10As Brian notes, it's a pretty simple matter to just replace the pot with an analog voltage. There is nothing in the pot circuit that has anything to...11 replies | 453 view(s)
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14th August 2019, 19:31barry replied to a thread Decoupling CAP using MOSFET? in Analog Integrated Circuit (IC) Design, Layout and FabricationHuh? Why on earth are you using a MOSFET for a decoupling cap????? Why not use, um, a CAP? But assuming for some bizarre reason the only...5 replies | 296 view(s)
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14th August 2019, 14:45Questions for you: 1) what kind of “sounds”do you want this to make? You don’t need MP3 to make beeps. 2) How long do you want the battery to...4 replies | 218 view(s)
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14th August 2019, 07:20Just telling us “they don’t work” is meaningless. Do they explode? Do they make strange noises? Give us SOMETHING. Maybe it’s your reset circuit....8 replies | 302 view(s)
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13th August 2019, 20:27You mean the welder CONTROL voltage is 0-6.2? It’s still unclear what you’ve got going on here. Saying “it monitors all three connections” is...11 replies | 453 view(s)
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12th August 2019, 22:06I’d use a small microprocessor and a digital pot. They do make motorized pots that can be controlled by an analog voltage, but they are big and...11 replies | 453 view(s)
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12th August 2019, 18:55Not sure what you’re talking about: “send 0-6.2 V through a potentiometer”, but then you say the welder is “monitoring all three connections...” . Do...11 replies | 453 view(s)
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11th August 2019, 16:51Vertical gain1 replies | 152 view(s)
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8th August 2019, 16:50barry replied to a thread How to use the same RELAY on 12V & 24V vehicles in Hobby Circuits and Small Projects ProblemsPWM is waaaaaaay overkill. You can accomplish the same function with a parallel resistor and cap driving the relay.10 replies | 399 view(s)
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8th August 2019, 03:42barry replied to a thread How to use the same RELAY on 12V & 24V vehicles in Hobby Circuits and Small Projects ProblemsSSRs don’t draw anywhere near 47mA. You make no mention of what your load current is, which will dictate the coil current. Reed relays draw about 10...10 replies | 399 view(s)
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8th August 2019, 03:04barry replied to a thread How to use the same RELAY on 12V & 24V vehicles in Hobby Circuits and Small Projects ProblemsWhy not use a regulator, or even a zener, to drive the relay? Or, a little more complicated and a little less reliable, have the MCU monitor the...10 replies | 399 view(s)
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7th August 2019, 16:39barry replied to a thread Estimated cost of high volume PCB assembly in Professional Hardware and Electronics DesignI think there are just too many factors to give you a "rule of thumb". You also have to consider: pin pitch; number of components; standards; etc....1 replies | 291 view(s)
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6th August 2019, 18:18barry replied to a thread This is a simple capacitor or it has a resistor inside it? in Service Manuals, Requests, Repair TipsIt says right there that it's .25uF 630V. But it shouldn't read 30 ohm. HPF is probably just a manufacturer's number. Throw it away and buy a new...3 replies | 180 view(s)
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4th August 2019, 20:55barry replied to a thread IC Touch and nrf24L01 in PCB Routing Schematic Layout software and SimulationWhat on earth is an “nrf”?? National Retail Federation? When you post a question here don’t assume everyone knows your arcane abbreviations.4 replies | 368 view(s)
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2nd August 2019, 22:42barry replied to a thread What does "great linearity" means for a ring oscillator? in Analog Circuit DesignI Sorry to disagree, but a sinusoid is a transcendental function, NOT a linear function. The linear response of an amplifier means if you plot the...8 replies | 367 view(s)
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2nd August 2019, 17:07barry replied to a thread What does "great linearity" means for a ring oscillator? in Analog Circuit DesignThe deviation of a sinusoidal signal from the ideal has nothing to do with linearity. A sine wave IS nonlinear! Maybe this is a language problem.8 replies | 367 view(s)
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1st August 2019, 23:59Obviously OP is going to take all the answers and average them.5 replies | 435 view(s)
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1st August 2019, 19:09barry replied to a thread What does "great linearity" means for a ring oscillator? in Analog Circuit DesignIf you're using a voltage to control the oscillating frequency then the linearity is the relationship of voltage to frequency. In other words, if you...8 replies | 367 view(s)
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31st July 2019, 14:40barry replied to a thread What is the Max RMS System Noise before 'hiss' is can be heard in Headphones. in Analog Circuit DesignYou already admitted that this is pretty subjective, so there really is no answer. But, nominally, the minimum detectable level is 0 dBm SPL. This is...3 replies | 325 view(s)
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30th July 2019, 23:27barry replied to a thread First attempt at USB differential pair routing on a 2 layer board. Acceptable or not? in Professional Hardware and Electronics DesignWell, to be honest, I don't think that kink matters one way or the other. But I cannot overemphasize the necessity of a solid ground plane. Sure, you...10 replies | 883 view(s)
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30th July 2019, 14:37barry replied to a thread First attempt at USB differential pair routing on a 2 layer board. Acceptable or not? in Professional Hardware and Electronics DesignYou have to understand WHY you’re doing something rather than just blindly following some “rules”. The reason you want the traces of a differential...10 replies | 883 view(s)
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