Matsushita® Bd-mlt Uj232as Firmware Update

Audio Interface Module RS232 - TTL


This circuit is only inteface RS232 to TTL, the aim is to use it to communicate with a microcontroller with the PC.

The idea of \u200b\u200bthis development is to build this interface in modular form to allow its use in the protoboard.Como is then the circuit was removed from its datasheet and the PCB was created as small as possible without using SMD integrated for ease in getting the components and assembly.

The PCB is as follows, in the following link can be downloaded in pdf ready for printing on transfer paper.

Here are some photos of the completed development.

Test circuit with a microcontroller sending data and receiving them in PC through HyperTerminal program.

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FM receiver of 1.5 MHz to 110MHz with TDA7000

This circuit is known is the TDA7000 and huge amounts of applications. This is being proposed is the most common as an FM receiver that goes from 1.5 MHz to 110MHz band-run. The integrated
detail can be seen in its datasheet.
The circuit itself was developed to capture the satellite NOAA13 (meteorological satellite), of course they are saying but emits NOAA13 frequency of 137.5 MHz and this receiver only supports up to 110MHz, well the reality is that I had to make a prescaler by an RF FET amplifier, but then I propose this circuit so far only covers the TDA7000 so also pretty funny because one of the uses to which it is as commercial FM radio receiver and the TDA allows us, but if we go down a little often as we hear about 50MHz channel 2, and good in between there are other transmissions that go there.
As if a circuit to experiment, and that just vary the amount of turns in the coil, we more or less local oscillator frequency.
NOTE: The circuit must be assembled on board, since it tends to breadboard Whimper and could fail.
below shows the application circuit.
Resize the PCB.

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Tester RJ45 ( without MCU) Muscular Contractor

Like UTP cable tester for RJ45 Ethernet networks that is posted on this blog, this is the difference that requires no MCU or firmware, is developed with conventional digital electronics.
is a testing tool for UTP Level 5 and RJ45 connectors in order to test the pairs for the ethernet standard.
circuit is nothing but developed based sequencer to 4017 whose main function to create a consecutive sequence of sweep between the 8 bit, which varies its speed to 555 by the potentiometer.
The only control you have this tester is the frequency adjustment, which can be done with a common potentiometer or with a preset to shrink.
The circuit is as follows:

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This circuit is a contractor or muscle stimulator.
The purpose of this is educational, because its development was to the study of muscle contraction in terms of power in this case the contractor delivers 2mJ to its output at this level energy we obtain a good contract which I tried in my pain free, if used with appropriate electrodes, in my case I use electrodes which are available online for $ 20 ar.
The circuit operation is very basic, consists of an oscillator and a variable current limiter for the output stage, this output stage is an inverted transformer 220V to 12V 300mA and both the driver and the control processor limitation outlets are developed with a TIP31C each.
The 555 is responsible for generating the pulses to be monitored in the series that has led to his departure, thus leaving the control frequency and control of these same intencidad be adjusted for treatment area.
NOTE: Keep use criteria.
Then leave the same circuit.