Search results for query: *

Hello, Is it possible to get a solenoid valve which won't open if the water pipe is iced up? -but will open if its not? We design domestic showers which are tmperature controlled by stepper valves. If its cold and the cold pipe ices up , then only hot can get through and the customer gets...

Hello, The basis of this thread is: If you have a signal that you are sending across a PCB to a uC…..is it better to send the signal as a current , or as a voltage? (incidentally, the PCB has three ~5W SMPS’s on it.) - - - - ---- - - - - - - --- - - - - - - - - - - - - -- -- - - - ….is it...

Hello, We design domestic water temperature controlled showers. Stepper motors adjust hot and cold flow rates. If the water in the pipes is ice, and we try and rotate the stepper valves, these valves break. So do you know how we can detect if the water is ice or liquid.? ...its not...

Hi, Do you know what is the non-switching supply current (ICC) of the NJM2673 bipolar, switch-mode, stepper motor driver IC ?. NJM2673 DATASHEET: http://semicon.njr.co.jp/njr/hp/productDetail.do?_isTopPage=false&_productId=1690&_moveKbn=PRODUCT_DETAIL_MOVE_SPEC ...or download NJM2673...

Hi, I have come up with two cheap FET gate driver circuits for driving the gate of a power mosfet in a switch mode solenoid driver. The PWM signal is provided by the output pin of a microcontroller. The solenoid current is 200mA. The FET Vgs(th) should be between 0.8V and 3.5V...

Hello, Will we damage our Freescale MC9S08AC60CFGE microcontroller by driving a FET directly from a microcontroller output pin, with no series resistor, (and no gate driver circuitry)? We are powering solenoids via switch-mode solenoid drivers which comprise FETs being driven directly from...

Hello, I am wanting my comma separated list of variables from my application to go into an excel document ... When pasted into a cell, excl just makes it into one number. This does not happen with any other list of numbers used. Here is the list...

Do you know of any companies who use mains powered equipment which controls stepper motor valves to manage fluid or water flow?

Hi, I have some data points that form a curve. I wish to put the points into excel and get it to put an equation to the line. Do you know what is th name of the Excel math software feature that does this...so that i can install it. Also, do you know how i can go about this?

Hi, My boss just recently asked me to design and layout a 20W SMPS (offline flyback , vin= 85-265VAC, Vout = 36V). This afternoon he came by and told me that the company also need a 100W variable speed Triac drive in the product, and so please could i put this on the 20W PCB too. Would i be...

Hello, I wish to use the TLVH431 to get opto-isolated feedback in an SMPS. The problem is that this SMPS has an output voltage of 36V, and the maximum allowable cathode voltage of TLVH431 is 20V. Do you think that it is possible to use the TLVH431 here? Is it right that all I have to do...

Hi We are using the 500mA fuse of this series (Littelfuse 452 series) FUSE DATASHEET: http://www.littelfuse.com/data/en/Da...454_Series.pdf The current flowing in this fuse will be as follows CURRENT WAVEFORM: http://i55.tinypic.com/2ed9hf8.jpg its peak is 1.2A its ON for 6.2us, then OFF...

Hello, Please could you help me in making a noise-free (as far as possible) connection to a NTC Thermistor? We are continuously detecting temperature by using the ADC of a microcontroller to read the voltage across a divider ……one resistor of which is the NTC Thermistor. -before reading...

Hello We are driving a bipolar stepper motor from a 36V rail via a chopper-type stepper motor driver. We are worried about damaging the stepper driver IC when the stepper motor is accidentally disconnected from the stepper driver PCB whilst the stepper motor is actually running. (we...

Hello We are using the LM2937-3.3 linear LDO voltage regulator to get 3.3V from 5V. Output current is 50mA maximum. LM2937-3.3 DATASHEET: http://www.national.com/ds/LM/LM2937-2.5.pdf The previous engineer has placed a series Schottky diode (D12) following the LM2937 (i.e, the Schottky is...

Hello, this is my step-down converter: ..it is for ... Vin = 36V Vout = 5V Pout = 1.67W Max SCHEMATIC: http://i55.tinypic.com/28lwh9s.jpg It must go into skip-cycle in light load, hence the comparator. It has a lot of components, but i see no cheaper way of doing this...since i need a good...

Hi, Do you have any suggestions for a motor and a variable speed drive combination for a pump for a domestic shower? We already have a fixed speed AC motor as a pump, but now we want to do variable speed drive. (so people can have variable pressure shower water, as they choose) Our fixed...

Hello , this capacitor's ESR is 0.141R at 120Hz. (Rubycon TLV series , 1.5mF, 16V) -but do you know what is its ESR at DC (Zero Hz) ? Datasheet as a file download:- http://www.2shared.com/document/YEIECZh3/T...ic_capacit.html Datasheet on web:-...

Hello, Do you know if its possible to have a touch-type panel for buttons inside a shower cubicle control panel. ....i.e. push buttons to select options like start-stop are a nuisance and keep breaking becasue people with soap in their eyes bang the buttons too hard. --so we want to change...

Hi, We are thinking of using latching solenoids to divert water in domestic water pipes. We see on datasheet that it takes one Watt of electrical power for 20ms to latch the solenoid. -but after a few years of use, will it take more time to latch....eg , 1 Watt for 40ms? here is the...