Soldermans Basic Electronics
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“Audio Amplifiers, Voice Recorders Clocks, Counters & Timers, Data Acquisition & Control Educational Kits, Test & Measurement ”
K1001 – 8 Channel Serial Servo Controller, Assembled & Tested
K1001 is an 8-Channel Serial Servo Controller based on the Atmel 89C2051 microcontroller. It accepts RS232 or TTL serial data from a computer or microcontroller and outputs PWM (pulse width modulated) signals to control up to eight RC servo motors (as used in radio-controlled model airplanes, cars, etc.). Unused servo pins can be reconfigured for digital output to drive on/off devices.
Up to four controllers can be multi-dropped on a single serial port for controlling up to 32 servo motors – more on request.
Many people give up on Wireless Keyboard Mouse Combo after a few months of “Novelty”. This is due to the chore of replacing batteries and also the cost and wastage (carbon foot).
Then i have long been suggesting, nineties, ferrite smps coupled charger docks. This is like RFID, but more like RF power transfer. One half of Ferrite E-Core is in the Gadget and the other half is in the Dock. When the Gadget is docked it is sensed and power transfer just like in SMPS. Rechargeable batteries in the gadget.
How-To Convert Wireless to Pseudo-Wired
Wired Wireless Keyboard Mouse Combo -Here is the Schoodle for building this. The Mumbo Jumbo to make a Wired-Wireless Combo is below.
Now you got a Wireless Combo, it can be converted into wired yet wireless, it is simple the wires will now carry 3V power to the Keyboard and Mouse, so no batteries. A little gentle and smart drilling is needed for the Mouse.
Get a 5V Adapter, the ones used for charging phones and music players. If you cannot get 5V use a 7805 to derive a 5V from 6 or 9. Use two 1N4007 in series on the positive line to drop 1.5V – test out with a dummy load of 10K and 100uF cap. Now use this to power both the mouse and keyboard with thin dual-core wires leading to the battery terminals. Soldering this may be a delicate job. Now you got a Perpetual Wired Keyboard Mouse Combo. The Interface still remains Wireless.
Another way is use Rechargeable Batteries for both. The wires will carry exactly a regulated 3.3V from a LM317 circuit which can be tweaked. The Mains adapter can be any 6V or 9V raw DC. You can have a Connector for the power wires when you want it to be wire free. This may require greater Gadget Opening and Drilling Expertise.
Reuse – Be Earth Friendly – Keep your Carbon Footprint smaller than that of a Yeti.
“VELLEMAN nv has been a major distributor of electronics for more than 35 years. Our warehouses contain over 18,000 different products from 50 brands.”
- Velleman kits & oscilloscopes
- Transformers, coils & motors
- Semiconductors & sensors
- Passive components
- Batteries & chargers
- Adapters & power supplies
They have the Test bench tools, parts and also all the prototyping materials.
A Velleman Power Supply for the Test bench
Velleman Inc. 7354 Tower Street, Fort Worth, Texas 76118
I got a strange problem as i added more and more peripherals, the pc gave odd messages, “i cannot detect what you are doing” and things like that. I almost flipped trying to locate the culprit. The problem was not in any peripheral but in the USB port powering the system itself. The SMPS was not loading much. Certainly the peripherals were drawing more and the warning could have been more like “use your own power”. Computer Data Interface
I could not locate a powered USB with any vendor close by, so i built one and it works perfectly, Now it doubles up as a UPS Low Batter Indicator, by rare coincidence. If the Unregulated DC is above 7 volts, then no bugs. When i adjust the unregulated DC to the 7805 to around 6.9V, then i have a advance warning system.
When power fails, i keep working and listening to music from a Flash Thumb drive. When music stops, i turn of computer, the lead acid batteries gone below 20 V DC. This avoids deep discharge of my batteries. The Powered USB gets undetected when the supply falls below 4.5 probably.
This is a simple charger you can build for devices like iPod or iPhone. It works for ipod touch. It can be modified for any device. This may need no modification for devices that are charged using PC USB port.
This is a Schematic Doodle called Schoodle. Use it for Learning and understanding. Build and test only when you have practiced and gone beyond simple electrical and electronic circuits. Mistakes can damage your portable device or even waste your components. Hence take care, work systematically, not like me. See the mess i have created below.
Without Audiophiles and Ham-Radio enthusiasts, the field of Electronics would be Dreary and Gloomy.
Here is a nice page with refreshing illustrations, this page helps initiate a Electronics Newbie in the complex science of Schematic Reading.
What’s that you say? You don’t know your AC from your DC’ Audio is considered an Alternating Current, a.k.a. “AC.” (So is 120-volt “wall” power.) But electronic circuits need Direct Current (DC) to turn them on, from batteries or power supplies.
DIY Pages and Know-How for those who love vacuum tubes, computers, and hearing music in its pristine form. There is an Audio and Electronics section is for the DIY computer audiophile.
My Notes – Even though i had Electronics Junk in my lab, when i was at school. (I used to call it Nuts-n-Bolts) The first project i saw being built by a friend was a Guitar Pickup using Germanium Transistors/Diodes. This was my first semiconductor schematic reading. Get into electronics now with a Audio Project, or ….
“These are some educational java applets I wrote to help visualize various concepts in math, physics, and engineering.” – Paul Falstad
- Math and Physics Applets – MyPhysicsLab – Physics Simulation with Java.
- Index of Circuit Examples – Demonstrates various electronic circuits.
- Digital Filters – Filters digital signals and plays the output on your speakers.
- Acoustic Interference Applet – Audio interference between your speakers.
- Waveguide Modes Applet – Electromagnetic waves in a waveguide.
- Antenna Applet – Generates antenna radiation patterns.
Analog Circuit Simulator Applet – Demonstrates various electronic circuits.
“This java applet is an electronic circuit simulator. When the applet starts up you will see an animated schematic of a simple LRC circuit. The green color indicates positive voltage. The gray color indicates ground. A red color indicates negative voltage. The moving yellow dots indicate current.”
iCircuit is the easy to use electronic circuit simulator and designer – the perfect tool for students, hobbyists, and engineers.
Its advanced simulation engine can handle both analog and digital circuits and features realtime always-on analysis. It is the perfect companion to students, hobbyists, and engineers.
Build any circuit, tap play button, and watch dynamic voltage, current, and charge animations. This gives you insight into circuit operation like no equation does. While simulation is running, adjust circuit parameters with analog knob, and the circuit responds to your actions in real time.