105yo Ted Wale still builds FM bugs in his lab, and carves his own PCB's (none of this etching rubbish!) Dave caught up with him in his backyard workshop in Cabramatta in Sydney. http://www.eevblog.com/forum/blog/eevblog-874-world's-oldest-electronics-hobbyist!/
Teardown Tuesday.
Dave tears down a cash register found in the dumpster.
Does it have any useful parts to salvage?
German brand Quorion QMP 3282
And a look inside a thermal print head.
Datasheets:
http://www.powertipusa.com/pdf/pg12864ak.pdf
http://www.altera.com/literature/ds/m3000a.pdf
http://www.paradigmtools.com/docs/R8820.PDF
...
https://www.youtube.com/watch?v=xLmGWhk7t-0
The most amazing feature of the new Siglent SDS2000X HD 12 Bit Oscilloscope was surprising!
Teardown time.
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Forum: https://www.eevblog.com/forum/blog/eevblog-1530-siglent-sds2000x-hd-12-bit-oscilloscope-teardown/
00:00 - New Siglent SDS2000X HD 12 Bit Scope
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#ElectronicsCreators #Siglent #teardown
...
https://www.youtube.com/watch?v=lUAevbBh0rQ
Dave saved this classic from the dumpster, a HP 1740A 100MHz dual channel analog oscillocope from the mid 1970's.
It wasn't supposed to be working so this is a look at the problem, a mini teardown, and some basic PSU troubleshooting.
Update: Even after 4 hours it still doesn't fail with the covers off. So likely to be some sort of thermal issue as suspected.
Forum: http://www.eevblog.com/forum/blog/eevblog-803-hp1740a-analog-oscilloscope/
Original HP Journal article on the HP1740A:
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1975-12.pdf
Acknowledgments
The 1 740A design group was led by Stan Lang until the start of pilot production when he transferred to another project. The design team included Jim Garner, mechanical design including the vertical
attenuator switch, Eldon Cornish, who designed the horizontal section, and Van Harrison who designed the CRT circuits, power supplies, and gate amplifier.
...
https://www.youtube.com/watch?v=Cmz8bzUsj7E
What is the main chipset used in the EEVblog BM235 Multimeter?
Dave finds out.
http://www.ic-fortune.com/
http://www.cyrustek.com.tw/
http://www.hycontek.com/
http://www.hycontek.com/attachments/DMM/DS-HY12P65_EN.pdf
Forum: http://www.eevblog.com/forum/blog/eevblog-912-bm235-multimeter-reverse-engineering/
EEVblog Main Web Site: http://www.eevblog.com
...
https://www.youtube.com/watch?v=UKIzhz0XLaQ
Teardown Tuesday.
Repairing a Yamaha Surround Sound Receiver Dave found while Dumpster Diving.
The fix for this fault is HERE: http://www.youtube.com/watch?v=MwvjAtSr5t8
Service Manual: http://elektrotanya.com/yamaha_rx-v557_v457.pdf/download.html
Forum Topic: http://www.eevblog.com/forum/blog-specific/eevblog-378-dumpster-diving-teardown-repair
EEVblog Main Web Site:
http://www.eevblog.com
EEVblog Amazon Store:
http://astore.amazon.com/eevblogstore-20
...
https://www.youtube.com/watch?v=Zje_ihjZdLM
Repair of a Garmin GPS unit, with characteristic Dave screw-up and Murphy.
https://www.eevblog.tv
Forum: https://www.eevblog.com/forum/blog/eevblog-1281-garmin-gps-repair/
#Repair #GPS #Garmin
EEVblog Main Web Site: http://www.eevblog.com
The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2
Support the EEVblog through Patreon!
http://www.patreon.com/eevblog
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Buy anything through that link and Dave gets a commission at no cost to you.
Donate With Bitcoin & Other Crypto Currencies!
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...
https://www.youtube.com/watch?v=Qt-lTpa1pJk
Dave looks at his TOP 5 (plus change) Jellybean Voltage Regulators and References, and explains why you need to know them.
00:00 - Jellybean Voltage Regulator & References
01:52 - 78xx Linear Voltage Regulator
08:01 - Adjustable Voltage Regulator
13:52 - 1117 Low Dropout Regulator
15:21 - LDO Stability
20:01 - LM4040/4041 Voltage Reference
24:38 - Using a Reference as a Regulator
30:53 - TL431 Voltage Reference
38:58 - Use as a PSU regulator
40:43 - Beware of Stability
41:43 - REF01 a better Voltage Reference
Forum: https://www.eevblog.com/forum/blog/eevblog-1438-the-top-5-jellybean-regulators-references/
Subscribe on Odysee: https://odysee.com/@eevblog:7
EEVblog Web Site: http://www.eevblog.com
The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2
EEVdiscover: https://www.youtube.com/eevdiscover
Support the EEVblog through Patreon! http://www.patreon.com/eevblog
AliExpress Affiliate: http://s.click.aliexpress.com/e/c2LRpe8g
Buy anything through that link and Dave gets a commission at no cost to you.
Donate With Bitcoin & Other Crypto Currencies!
https://www.eevblog.com/crypto-currency/
T-Shirts: http://teespring.com/stores/eevblog
#ElectronicsCreators #Jellybean
...
https://www.youtube.com/watch?v=YHRxvUqy3Uw
Looking at the new $80 Zoyi/Zotech ZT703S Dual channel 50MHz 25,000 count 0.05% handheld oscilloscope/multimeter compared to the single channel 10MHz 10,000 count ZT702S
https://s.click.aliexpress.com/e/_DeSzRKZ
ZT-702S review: https://www.youtube.com/watch?v=aUU-PGUnd0E
Forum: https://www.eevblog.com/forum/blog/eevblog-1597-zoyi-zt-703s-$80-2ch-50mhz-oscilloscopemultimeter-review/
00:00 - The new $80 ZT-703S vs the $60 ZT-702S
03:40 - Power on and screen differences
06:25 - Multimeter
07:49 - The Bargraph is still a complete JOKE
08:50 - Power-off memory test
09:41 - Dumb Arse Dave BRICKS the ZT-702S !
10:23 - The SAME current measurement FAIL
12:19 - 0.05% ?
13:17 - Same BNC connector issue
13:44 - The signal generator is still a joke
15:53 - Trigger level issue FIXED
16:39 - Range overload bug FIXED
19:10 - Teardown
25:07 - Oops...
25:21 - Battery life and current consumption test
26:54 - Conclusion
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#ElectronicsCreators #Review #Oscilloscope
...
https://www.youtube.com/watch?v=kpzNVsSmUu0