This blog will keep to a simple theme of my tinkering with electronic and computer related toys, gadgets, projects and the like. I do hope from time to time there is something for someone to find when they are exploring these things for themselves. From an early age, I was always attracted to electronic gadgets an I continue to enjoy myself with my hobby. Unfortunately with a busy life, time becomes short an I can not indulge myself like in the past.
The DT-100K is a great simple tool for testing Diodes and Transistors. I also like the throw back style of the DT-100K front panel's lay out. This tool allows one to identify if a Diode is in working order and the Cathode or Anode of the Diode; more over, the DT-100K will identify a NPN or a PNP Transistor and that the Transistor is working. In the video I test out the DT-100K. First, I test that the Diode testing functioning is working properly. I start by shorting the black and red leads together (this allows me to use the internal Diode in the test) and push in the test button. The alternating LEDs are a indication of a correct response. The last part of the Diode test is to connect a diode to the red and black leads. The two LEDs indicate which is the Cathode or Anode. The black lead out-put is the left LED and the red lead out-put is the right LED. The LED that lights indicates the Cathode side of the Diode. Second, I test the Transistor Operation, I short the yellow and black leads together and press the test button (shorting allows me to use the internal PNP or NPN Transistors in the DT-100K) then vary the base current with the knob and switch between the two Transistor types. The last part of the test I use a NPN-transistor. I do this test using the yellow test socket then with the green (emitter), yellow (base), and black (collector) leads. The only modification I had to make was to add four washers to the screws that hold in the front panel. If one uses just the screws, the panel will not stay secure because the heads are too small
First stage of assembly
Potentiometer connected with bare wire
Leads installed knots used to take pressure of solder to PCB
Connected Battery snap and Push button switch
Soldering the alligator clip
When having to solder to bare metal, it is helpful to use fine sand paper to scratch the metal, so the solder applies better.
Much like the last Substitution box the Model K-37 is easy to assemble. The resistance values are from 10 ohms to 1000k ohms or 1 meg ohm in 24 steps. A good tool for determining the desired resistance values in circuits under design or test. The video below show the testing out to make sure the knobs are in correct position.
Resisters through my magnifying lamb
Two knobs and switch upper center
The green jumper wires activate the knob based on the switch position
Assembled before adding front panel
Determining correct position for K ohm knob (right)
Determining correct position for the ohm knob (left)
The Elenco's Model K-38 Capacitance Substitution Box is a trouble shooting tool that can be used in repairs. For example, where a capacitor value is unknown or in new electronic designs that the capacitor value is aloof. The Capacitance values are from 100picoFarad to 0.1microFarad. The video below shows the test out of the substitution box using a Multimeter.
Finished
Capacitors, switches, and wires installed on the PCB
PCB back soldered capacitors, switches, and jumpers installed
This was a fast little gadget to assemble, which translates sound into light. Sound is taken in by a microphone and translated into light using four high-intensity LEDs. Sensitivity of the microphone can be adjusted using a potentiometer. This unit has practical use for the hearing-impaired, for example, to indicate a teleophone and doorbell ringing, or for the fun of it.
I had to put this project together in a rush; in addition, for use as a receiver for a AM and FM transmitter that I have yet to assemble. In the video, I am tuning the FM station with no test equipment and with the aid of a Voltage Meter. In the future, I plan to do a second assembly of this model with more details and properly tested with an Oscilloscope, Function Generator, and Voltage Meter. This was a fun project because one assembles the radio in modules. Again, I will do a more detailed check out with the second model. I just had not posted in a few months and wanted to let everyone know the blog is still alive.
The objective of this experiment is to demonstrate wait mode with multiple colors; more over, I view the waveform signal between the input and output of the 10K ohm resistor. Lastly, this experiment ends the CI-22 and concludes the PK-201 experiment kit.
