Equipment catalog

…need to check) strawberrymaker Mon Sep 14, 2015 6:20 pm @RogerClark Just checked the drv8825 drivers. their threshhold for high signal is 2.2-5.5V, so thats no issue. a4988 is also no issue, b…

…nd SPI interface it would really make the 3d printing run extremely smooth a4988 and drv8825 has only 16 and 32 microsteps respectively … ver_Boards but i’d guess it is also part of the reason…

…n was to use the same approach as Fysetc F6 – so that the board could support A4988, DRV8825 , TMC2100/2130/2208 – and 2130 in SPI mode and 2208 in UART mode – just by using jumpers, and no cab…

…ave to shield it. For the negative supply-voltage I take a MAX660 , its’ better than ICL7660 ( smaller R-on and higher switch frequency (about 80kHz)). For the AD9850 exists a SPI-Lib for Ardu…

…017 5:32 pm I want to try it at first with discrete Dual-Opamps, and perhaps with an ICL7660 or MAX??? to generate the -5V, so I can spare VGEN-Pin . But perhaps also with the MCP6S91/ 92. I h…

…me more audio circuits I would prefer a voltage converter for a negative power rail. ICL7660 is your cheap friend, for more serious applications use the LT1054 victor_pv Thu Mar 22, 2018 1:49 …

…) I’m wondering about ULN.., in 2016 I would use Mosfets only, IRLML2502 or IRF7413 / IRF7311 -Dual for ex. The stepper module PCB shows 2 lines outside. strawberrymaker Sat Mar 05, 2016 9:17 am…

…cts , too) I’m wondering about ULN.., in 2016 I would use Mosfets only, IRLML2502 or IRF7413 /IRF7311-Dual for ex. The stepper module PCB shows 2 lines outside. strawberrymaker Sat Mar 05, 201…

…e from China but as far as I can tell the only changes required are changing fets to IRLB3034 ’s and somehow swapping the voltage pin to 3.3v on nucleo board. victor_pv Thu Aug 03, 2017 7:41 pm …

…rchical projects , too) I’m wondering about ULN.., in 2016 I would use Mosfets only, IRLML2502 or IRF7413 /IRF7311-Dual for ex. The stepper module PCB shows 2 lines outside. strawberrymaker Sat …

…ent headroom 4.2 – 0.22 ~ 3.9v to keep running off a single charge till around 2v. a lm1117 or ams1117 has a 1v dropout which would be ok for 5v but with 4.2v that leaves 3.2v at the stm32 ev…

…he USB cable attached (into a powered hub at the other end) I measured 0V out of the lm1117 regulator. Looking at the schematic I guessed it was worth trying applying 5V to VIN. Frankly I don…

…m The maple mini clone (Baite) is fed from USB 5V and it has its own 3.3V regulator ( LM1117 -3.3V) on board. All components are fed with this 3.3V. The SD card module has no regulator, and get…

…ovement: To replace the L in the +Vref rail with say 1k resistor, and something like LM136 -2.5 voltage reference from +Vref against the ground (or against the -Vref ??) :geek: Pito Thu Dec 1…

…less version. damn). also the LM358D can be dropped and replaced with an LMV321 (not LM321 ). i’m not going to go back to the CH340G, i like the idea of being able to connect to the SPI inter…

…esn’t have a crystal (and there isn’t a 20-pin crystal-less version. damn). also the LM358D can be dropped and replaced with an LMV321 (not LM321). i’m not going to go back to the CH340G, i l…

… here: … -auta.html The circuit board includes the following integrated circuits: U1 LM393 (K, L-line conversion) U2 TJA1050 (HS-CAN transceiver 5V) U3 MP1482DS (step-down 2A, sync rectified…

…ut any particular load on the mini! As a silly and cheap workaround I use a separate LM7805 (with heatsink) to reduce the power and connected it to the “Vin” of the maple. racemaniac Tue May …

…er mausi_mick Fri Mar 24, 2017 4:15 pm yes, on the right is the stabilization with a LM7806 (and 2 Diodes to reduce to about 5V) and the MAX660. There are 3 connections to the preamp for -5V,…

…or you. Special-purpose keypad controllers with more than 16 IOs exist as well, e.g. LM8330 – but these are not breadboard-friendly nor easy to solder manually. ag123 Mon May 07, 2018 8:36 am…

…pin crystal-less version. damn). also the LM358D can be dropped and replaced with an LMV321 (not LM321). i’m not going to go back to the CH340G, i like the idea of being able to connect to th…

…tive power rail. ICL7660 is your cheap friend, for more serious applications use the LT1054 victor_pv Thu Mar 22, 2018 1:49 pm The recommendations by Pito worked fine to pass the PT8211 outpu…

…, the preamp in DSO203 is very complex , is much work. Perhaps It’s easier to take a LTC6912 -1 (2 channel ,gain: 0,1,2,5,10,20,100) or an LTC6912-2 with gain 01,2,4,8,16,32,64), and you need o…

…with noise , therefore I have to shield it. For the negative supply-voltage I take a MAX660 , its’ better than ICL7660 ( smaller R-on and higher switch frequency (about 80kHz)). For the AD985…

… some light. To get started, I have these cheap modules … 1742472725, and they use a MAX9812 amplifier … X9813L.pdf. The circuit is pretty much the reference circuit (plus a XC6206 LDO to powe…

…efficiency and wide input voltage (9-30V). It is based on well known (but a bit old) MC33063 regulator. – On board Li-Po battery charger with automatic power supply selection. MCP73812 charger…

…73812 charger is used, adjusted at 70mA charging current. – Separate 3V3 regulators ( MCP1700 ) for digital and analog power planes. – On board CAN interface and micro-SD slot. – Custom UEXT con…

…blue pill I have setup as a BMP programmer I had to replace the LDO with a microchip mcp1702 . If I hadn’t shorted the power pins I’d still be using the original LDO. The mcp1702 is a 250mA max…

…STM32/STM32F4/libraries/Wire -I/home/martin/arduino/arduino-1.6.5/libraries/Adafruit- MCP23017 -I/home/martin/arduino/arduino-1.6.5/hardware/Arduino_STM32/STM32F4/libraries/SPI/src -I/home/marti…

…ould like to try to control the microstepping settings digitally via an IO expander ( MCP23017 ). Was just a crazy idea i had Very Happy ~Straw Slammer Sun Jun 12, 2016 8:36 pm strawberrymaker wr…

… or two of these. Similar alternative: MCP23S17T (10MHz SPI; SSOP-28 and smaller) or MCP23017 (1.7MHz I2C, SPDIP-28 and smaller) 16 bit I/O Expanders (<=1$ @ 100pcs). Pins on these are I/O and …

…ing stuff around, maybe it’s enough to use one or two of these. Similar alternative: MCP23S17T (10MHz SPI; SSOP-28 and smaller) or MCP23017 (1.7MHz I2C, SPDIP-28 and smaller) 16 bit I/O Expander…

…A7) Pins like the SPI-TFT (spi1). There is a nice project: with two spi-devices (ADC- MCP3002 and PGA MCP6S91) with Arduino-Code. But I think at first I try this: … illoscope/ mausi_mick Tue Ma…

…i.e use one very fast external ADC and an analog multiplexer or mulichannel input e. mcp3208 ( IF and its a big IF something like to mcp3208 can be preprogrammed to cycle through 4 inputs and …

… think the difficulties come with the TFT-Lib. Therefore I tried it with an I2C DAC ( MCP4725 ) with success, but In need Pins PB6 PB7, so I had to eliminate the TEST_WAVE on PB& Crying or Very …

…ADC code from the scope project (altered it a bit for this purpose), and connected a MP4725 DAC to my maple mini, and had some fun testing this little trick Smile How to wire it (on a maple m…

…ick Wed Aug 30, 2017 2:32 am I want to make the Offset with a DAC , I tested it with MCP4812 /22 (SPI-Interface), but had no success. I think the difficulties come with the TFT-Lib. Therefore I…

…he SPI graphic functioned, but I can’t activate other SPI devices like MCP6S91/92 or MCP4822 (DAC). I reduced the speed to 9MHz and back to 36MHz, but with no success. I tested it with “blue-P…

…w the second preamp is nearly ready, I changed the TL072 in the first stage with the MCP6022 (R.R) because supply-voltage is only 5V. The noise is from not perfect shielding . ? DLO138_ILI9341…