E.G the CMOS 4007. See the old handbooks for a '100dB amplifier' based on a RCA chip - there was a wiring error in that old description - IIRC it was 3800? - whatever, the 4007 is the same chip.
Murray vk4aok
E.G the CMOS 4007. See the old handbooks for a '100dB amplifier' based on a RCA chip - there was a wiring error in that old description - IIRC it was 3800? - whatever, the 4007 is the same chip.
Murray vk4aok
The Motorola McMOS handbook (2nd edition 1974) warns about this usage by pointing out that by cascading three such AC coupled stages, the last stage will be saturated by the noise from the first stage.
Paul OH3LWR
Take one P channel Jfet and one N channel Jfet and connect them in series so the two sources are together, connect the gate of each transistor to the other one's drain. This is known as a lambda connection, and if you plot the voltage vs current from drain to drain you will see a negative resistance region, usually around 3v (depending on the transistors). The circuit will work as a tunnel diode oscillator up to 100-200mhz.
Did you know that a carbon arc acts as a negative resistance? Run the arc on DC and put an LC tuned circuit in series with the arc (coil of heavy copper tubing) and you have a powerful oscillator.
connect the
after
necessary.
reliable
heater) or
ignition.
out.
Iput
course
Exactly-when I was a kid we made them like this all the time. As I recall, it came from "700 scientific experiments, with illustrations"...
>
I've used a light bulb in series with a rectifier to charge a car battery (just make sure that line ground goes to chassis ground ;-)
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
John Devereux wrote in news: snipped-for-privacy@cordelia.devereux.me.uk:
To save power, use the LEDs of a backlight to measure the ambient light to decide to switch the backlight on or not.
M.
-- Bitte auf mwnews2@pentax.boerde.de antworten.
We worked with a company that was developing an xray imager, and was buying very expensive electrically conductive glass (gigohms per square sort of range.) They discovered that certain welding glass was identical and about 1/20 the price.
John
btw, do you know a standard complementary pnp-transistor for the 2N2369, such like 2N3905 but with higher ft and less feedback capacitance? It seems that the manufactorers have almost no data on their internet pages.
mfg. Winfried
Going the other direction, I used the elements from a toaster as a load to discharge wet-cell lead-acid batteries. It was a discharge/charge cycling test.
John
A 2N2369 is a gold-doped NPN, gold-doped to kill storage time and improve recovery from saturation. I don't recall any PNP device with gold-doping... or the equivalent.
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
As a youngster I played with TTL DIP-ICs in my chamber and my parents next room felt that the tv was going crazy. The pins had long wires...
- Henry
schrieb im Newsbeitrag news: snipped-for-privacy@g43g2000cwa.googlegroups.com...
The 4007 is the classic crystal oscillator circuit. Don't forget the temperature characteristics!
- Henry
"Murray" schrieb im Newsbeitrag news:43884488$0$12455$ snipped-for-privacy@per-qv1-newsreader-01.i>
Anyone else remember the Radio Shack dry battery chargers based on a
7W night-light, a rectifier, and a flexible battery holder? The light is an (aproximately) constant current source...That is not new to me but thanks! Is the oscillator useful at 150MegHz? Modulable? Maybe I can make transmitter... Tell us more, please.
cu - Henry
"wa2mze(spamless)" schrieb im Newsbeitrag news:tT_hf.27576$ snipped-for-privacy@bignews6.bellsouth.net...
Idiode,
diode.
another
some
Don't forget the LED as an low-noise zener diode with integrated function control. Some high-fidelity enthusiasts use this in good audio amplifiers.
- Henry
"ehsjr" schrieb im Newsbeitrag news:R3thf.9922$BU2.983@trndny01...
Idiode,
diode.
another
some
There even exists LED specially taylored to the needs of doing duplex operation.
- Henry
"Frithiof Andreas Jensen" schrieb im Newsbeitrag news:dm6msq$bvk$ snipped-for-privacy@news.al.sw.ericsson.se...
light
yield
LED.
Bob Pease of National Semi mentioned a ONE AND ONLY transistor circuit above/under voltage rail converter (with detailed theory). I cannot remember the details. But interesting if sometime a slightly voltage behind the power rail is needed. For example to power a CMOS Opamp now doing rail-input.
- Henry
And optocouplers can do interesting things:
Very simple high-voltage opamp, up to 400 volts p-p.
Isolated totem-pole driver, from a few volts up to 400.
Current limiter.
Low-leakage diode, sort of like an LED painted black.
John
It also works for this: Vcc !/c --/\/\/\---+------! ! !\e V ! --- ----/\/\/--+--- too load ! ! --------------------
You get a current limit and an indicator light.
-- -- kensmith@rahul.net forging knowledge
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