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Old 20th January 2016, 05:15 PM   #141
shaan is offline shaan  India
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SMD under stripborad is sexy!!!

Makes me think, what if I...
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Old 20th January 2016, 08:37 PM   #142
Tubelab_com is offline Tubelab_com  United States
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What are those squares on the buss? Less heat needed to change a connection? .......they definitely look like SMT ceramic capacitors - what size is that, is there a 2424?
They are 10 uF 50 V ceramic chip caps in 2220 size. These were given to me by one of the component reps, TDK or Murata, not sure which, when I was working on a high powered LTE transmitter for the 700 MHz band. They were bypass caps on the supply line to the RF output transistors. They were also used in the 12 to 28 volt boost converter.

Most ceramic capacitors exhibit a piezoelectric effect which works both ways. They can translate PC board vibrations into voltages, and they will turn current pulses into sound. We learned all about this during the development of the Nextel cell phones which exhibited a ticking sound as the transmitter was pulses on and off. These caps were designed to eliminate this.

I used them because they are excellent bypass caps for nearly all frequencies and I have a bunch. I put them on a board, or a breadboard with an ordinary soldering iron and 60/40 solder. Don't use that no-lead crap!
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Old 20th January 2016, 09:10 PM   #143
Hearinspace is offline Hearinspace  Canada
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Ahhh, really?! I thought they might be copper squares. I once thought I was being pretty fancy by making a ground buss/plane from a piece of copper sheet cut into the shape of the space between all the components it served. I drilled holes all the way around the perimeter to take the wire leads. Turning out to be the shape of a paisley teardrop, all shined up it looked pretty spiffy. "Oooh , Art!" I thought, "right there in the chassis."

Then I learned how copper was a good conductor of more than just electrons. As I progressed inserting the wires around the edge it took longer and longer to heat the whole thing up , melting all the previous solder connections each time. By the end it was taking a couple of minutes for a connection.

Once I started making changes to the circuit I ended up making cuts at right angles to the edge between every connection to limit the heat transfer back into the plane - making it look like the top of a castle turret. It didn't work very well but was better than without. I wondered if maybe the squares above were a way of creating pads that could be de/re soldered without heating the whole bus so changes could be made with a small iron. Caps never entered my mind. Thanks.
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Old 21st January 2016, 08:56 AM   #144
shaan is offline shaan  India
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My newborn 10R 80W load made out of forty 100R 2W resistors.
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Old 21st January 2016, 02:13 PM   #145
Tubelab_com is offline Tubelab_com  United States
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I made a similar load for testing the 28 volt boost converter mentioned above. It used 24 X of 15 ohm 10 watt resistors and miniature toggle switches to give 12 steps of 30 ohms each, roughly 1 amp per switch. The resistors were operated slightly over spec, so I mounted a 12 volt fan from a dead PC on the front of the board facing the resistors. It kept things cool with only 6 or 8 volts on the fan. I ran this thing a lot, often for hours at a time during the early development and prototype testing cycle. I called this device the "load bank."

Our group did advanced development of new technology. We designed the circuitry, and build a few "proof of concept" prototypes, tested and documented the prototypes, then turned the whole package including all but one of the prototypes to a product development group. We offered support to the product group as needed.

After a few weeks I hadn't heard from the product guys, so I walked over to their building for a look. They had redesigned the boost converter to make it "better" and nothing worked....including the load bank.

The white cement resistors that I used were all brown. So was the PC board. The resistance readings were off too, some banks were open. The resistors were not blown, the solder had cracked and become brittle from the heat conducted down the leads because they had not been using the fan.....it made too much noise. Fixing the load bank was easy, just resolder everything.

So, I offer this advice, if you are going to run yours anywhere near max power for more than a few minutes, keep some air moving across it. A 2 watt resistor can not dissipate 2 watts in the middle of the board surrounded by a field of similar heat emitters.

Fixing their boost converter was a different story. They had decided that there wasn't enough safety margin in the semiconductors that I had selected, so they swapped in the biggest mosfet and diodes in the On Semiconductor catalog. OK, you do not need, or want a 50 amp fet in a 10 amp power supply, because the driver can't switch a 5000pf gate at 1 MHz without making round square waves. Ditto the diodes. Rounded square waves melt parts!
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Old 13th June 2016, 08:30 PM   #146
Tubelab_com is offline Tubelab_com  United States
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I have made two new ones in the last month or so.

The first started out as the prototype for the sound box below. After it was used for that purpose, I ripped out the multi position switches and installed 3 rotary encoders, added 8 more pots, and rearranged them all, then it became a breadboard for a drum machine, which after a few more changes, became a music synthesizer. It is a 1V/oct synth with analog voltage control inputs, but the sound engine is digital, based inside an Arduino compatible 32 bit ARM Cortex M4 processor board and a 44/16 DAC board. The proto board is getting worn, but there are several more changes and experiments planned before I make a new one. The yellow wires are digital inputs from encoders or push buttons. The blue wires are analog inputs to the 16 bit ADC, from pots or CV and gate inputs. The purple wires are the 3.3 volt buss to all the pots.


The second is a sound box for a military simulator. A friend is setting up some military surplus simulators for battlefield simulations. The surplus equipment is being reconstituted from several scrapped simulators, and I am helping fill in the missing electronics. This box is basically a WAV file player with several different triggers. I used the prototype to play drums, keyboards, and some other "instruments." This one makes machine gunfire, assorted explosions, and other battlefield sounds (whatever WAV's are on the SD card).
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File Type: jpg BarryBox_4_x.jpg (791.1 KB, 48 views)
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Old 13th May 2021, 08:37 AM   #147
wintermute is offline wintermute  Australia
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Wow no posts for nearly five years? has every one stopped using experimenter board? I thought I had posted my mic line driver circuit but apparently not.

Anyway here is my latest. It's a quick and dirty preamp to boost the output from a wireless mic to decent levels when plugged into a normal amplifier. It's a bit rough around the edges but I was building it to a deadline so my normal faffing about for months or years didn't apply

Tony.
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Old 15th May 2021, 12:39 PM   #148
Tubelab_com is offline Tubelab_com  United States
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Quote:
Originally Posted by wintermute View Post
Wow no posts for nearly five years? has every one stopped using experimenter board?
Maybe my aging mind simply forgot about this thread.....now that you have reminded me, I do have about 5 years of perf board madness, some working, some already canabalized for parts. I have pictures of most.

This picture shows the beginnings of a little guitar amp. It uses a push pull version of my UNSET topology. About a year ago when these pictures were taken the power amp section was built up and tested, mostly for more experience on the new technology. It squeezes 20 watts at 3% THD from a pair of tiny 50C5 radio tubes. I beat this thing up with an ADA MP1 guitar preamp, then let it run at 20 watts output overnight. It was making 20.03 watts the next morning.

The preamp circuitry will be copied from another of my DIY guitar amps when I find the time.

The design appeared in my UNSET thread here:

UNSET is coming?

The board is first mentioned in post#39, with the schematic and more info in post #57. Another member posted an LTspice file in post #62.

The perf board stuck between the scope and the power supply is my first pass experiment at the variable gain cell used in the Fairchild 670 compressor. It will become the Voltage Controlled Amplifier section in a vacuum tube music synthesizer, most of which will be prototyped on perf board. More on that in another post.

The whole UNSET concept started out as a push pull amp design three years ago. There is a 50 to 80 watt per channel amp board sitting behind one of my SPP boards (a 15 WPC EL84 amp). The perf board to the right was the very first implementation of the output stage. it is being driven by a hacked up driver board of my own design. They were used to refine the LT spice circuit into a working design that got implemented on the PC board with glowing tubes in it. It makes 50 WPC on an Antek toroid, and 80 WPC from a regulated power supply. This may become a Tubelab board at some time.
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Last edited by Tubelab_com; 15th May 2021 at 12:41 PM.
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Old 15th May 2021, 01:26 PM   #149
wintermute is offline wintermute  Australia
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Nice! I love the pic with the board balancing on the scope! One false move and it's toast!

Tony.
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Old 15th May 2021, 01:27 PM   #150
Tubelab_com is offline Tubelab_com  United States
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When my 41 year engineering career at Motorola ended we packed up everything and moved 1200 miles on very short notice. A lot of "stuff" was sold, given away, or trashed. The rest was boxed up and moved, twice. Now 6 years later we are still finding unmarked "mystery boxes."

The digital synthesizer boards that I made in the 70's were seen earlier in this thread. These boards were from the late 80's and early 90's.

The pair in the upper right are EVB's of my own design to play with the then new MC68HC11 parts. Both are fully expanded systems with a "Buffalo" boot ROM, static RAM and an EEPROM for program storage. The big chip has internal EPROM and ram.

The board on the left is a digital timing generator, useful for making all the signals needed for NTSC video. A year or three later it all fit into a PIC16C54.

The board on the lower left is an FM demodulator and digital interface. I used it for some digital RF experiments......early wireless MIDI stuff that failed miserably.

The board on the lower right????? I know I made it, I can see that it contains a PIC16F877, a MAX232 serial port chip, a fat cap for memory backup, and an LCD display. What it did / does is lost somewhere in a deep dark corner of my brain.
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