Just another footprint tester. The Everlight 19-337/R6GHBHC is super cheap; but its also pretty small.
You can order this pcb directly from pcbs.io
RGB LED Footprint tester
Evaluating the Si8540 Current Sense Amplifier
I needed a current sensor for another project. I found the Si8540 in Mouser’s catalog. It requires a very low resistance sense resistor. The output voltage is in the zero to 3V range. The Si8540 comes in a SOT-23 package and costs US$0.55/piece in single quantities.
I fabricated a prototype board that has holes large enough to solder 14 awg wires for load and source. Like most of my prototype boards, this one had a flaw in it (as seen by the jumper). Including the pcb, this board cost me less than US$2.00.
Using a current limited supply and some high wattage resistors, I compiled the data to chart the performance over a 3 amp load. The low of end of the current sense is skewed. The datasheet talks about the typical error at 1% of Full Load being 5% to 10%.
Finally Found a CA3020 (Epiphyte Build Log)
It took me nearly six months, but I finally sourced a CA3020. I tried AliExpress and eBay several times. I think I purchased four from different vendors on AliExpress; in every instance they did not have any in stock. I tried a few purchases on eBay from Chinese vendors with the same result. I finally found an individual in Romania who had one. I paid like USD$20 including shipping (ouch)
Smd inventory 9/3
10k 1206 partial reel
22nf 0805 partial reel
68pf 0805 partial reel
50k 0805 partial reel
100pf 0805 partial reel
22uF 16V partial reel
47uF 6.3V partial reel
680pF 1206 2500pc
82pf np0 0805 partial reel
100nf 0805 partial reel
100pf np0 0805 partial reel
470pf 08085 ~3900 pcs on reel
33nf 0805 partial reel
1nf 0805 partial reel
56pf 0603 partial reel
82pf 0805 partial reel
1uF 0603 ~100 unknown voltage
1uF 0603 ~100 25V (Mouser)
1k 0805 partial reel
22uh 1206 2000pc
red/blue LED Dialight p/n 597-7701-507 705pc
MMSD914T1G 3000pcs SOD123
47pf NP0 0805 360pcs
4.7k 0603 ~5000 pcs on reel
10k ~100
4.7k ~100
100R ~100
Machrone WB-C3-403025 ~500 on reel
78L05 ~100
Red LED 0805 ~20
Green LED 0805 ~20
Blue LED 0805 ~20
Whitre LED 0805 ~20
AP115AY33G-13 LDO 15V ~10
CD4066BM96E4 ~10
74hC4053D ~4 two channel mux
74HC4040PW ~2 twelve stage binary counter
MCP23008-E ~2 in/out I2C interface
AAT3681AIJS4 ~4 usb port/ac adapter
BCX56 ~20 NPN transistor 80V/1A ft 180mhz
2SC3337 ~30 NPN transistor 15V/100ma ft 4.4ghz
BAS16 3000pcs (new reel) TO-236AB
MMBZ5231BLT1 5.1V zener diode SOT-23 ~ 3000
MMBTH32_Q ~300
BAV99W ~50 SOT323
mmbt3904~100 PNP transistor
mmbt3906 ~100 PNP transistor
2N7002K ~100
MC34063A ~10 step-up/step-down switching regulator
C5706 ~20 PNP transistor ft 360mhz
L9110S ~30 Dual channel motor driver
200uf 100V electrolytic ~500
330nf 0603 ~ 4000 reel
BAV70 sot-23 ~ 1000
ZMM5228B 3.9v zener ~1000
3pf C0G 50V 0603 ~4000 reel
BAS19 SOT-23 ~1000
CDLL1A0 schottky diode ~ 700 DO-213AB