Arduino Prototype uses all standard through-hole components for easy construction, two of which are hidden underneath IC socket.
It's small, power efficient, yet customizable through onboard 2 x 7 perfboard that can be used for connecting various sensors and connectors. It's breadboard compatible so it can be plugged into a breadboard for quick prototyping, and it has VCC & GND power pins available on both sides of PCB. Headphone amplifier is small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from a single 9V battery.Īrduino Prototype is a spectacular development board fully compatible with Arduino Pro. 8-DIP machined IC socket allows to swap OPA2134 with many other dual opamp chips such as OPA2132, OPA2227, OPA2228, dual OPA132, OPA627, etc. Unlike other ESR Meters that only measure ESR value this one measures capacitor's ESR value as well as its capacitance all at the same time.Īudiophile headphone amplifier kit includes high quality audio grade components such as Burr Brown OPA2134 opamp, ALPS volume control potentiometer, Ti TLE2426 rail splitter, Ultra-Low ESR 220uF/25V Panasonic FM filtering capacitors, High quality WIMA input and decoupling capacitors and Vishay Dale resistors. It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic capacitors. It also analyzes transistor's characteristics such as voltage and gain. of 15: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15ĮSR Meter / Capacitance / Inductance / Transistor Tester KitĮSR Meter kit is an amazing multimeter that measures ESR values, capacitance (100pF - 20,000uF), inductance, resistance (0.1 Ohm - 20 MOhm), tests many different types of transistors such as NPN, PNP, FETs, MOSFETs, Thyristors, SCRs, Triacs and many types of diodes. This small supply is user friendly and fits nicely on my cluttered bench. With adequate input the LM338 makes a fabulous variable power supply. The diodes steer the current around the regulator and into ground, thereby protecting it from damage. Since the current spike may be many amps, the regulator may fail. Without the diodes, if this happens, the capacitors will dump their charge back through the regulator. Also the output of station supply may be shorted if some other device fails. This is a distinct possibility if using jumpers to attach it to the power supply. Diodes are included to protect the regulator from damage in case the input is accidentally shorted to ground. I chose one that illustrated variable output and included protection diodes. LM338's Data Sheet has several very helpful application notes and circuits. It began as a variable power supply based on an LM338 5A voltage regulator and external power adapter.
Or 8 x MR750 (MR7510) diodes (MR750 = 6 Ampere diode) or 16 x 1N5401 (1N5408) diodes.Ĭ2 four times 4700uF/50v or one 22000uF/50vĪfter many years of employing this ugly and clumsy bench power supply, I decided it was time to build something better, smaller and nice looking. Or eight BYW29 8 amp diodes (TO220 pinning cooled)
Remember to isolate the 2N3055 transistors from the chassis/radiator! Use a radiator (heat sink) of appropriate size and surface area insulating and heat-conducting spacer or at least a thin mica hot adhesive and thermal paste.ĭ1.D4= Bridge rectifier MB2504 (25 amps cooled) Or you could use eight BYW29 8 amp diodes (TO220 pinning) mounted on a heat sink. So no delay do to the discharge of C2, and so preventing output voltages from not return to zero immediately.Ī MB2504 is used as it is a 25 ampere rectifier bridge which also should be cooled. The relay is used to switch off the power supply voltage when the mains (S1) are/is switched off.
S2 switches between +- 3 Amps and full output current