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Obsolete Motorola IC
Dual TTL-ECL level translator gate https://4donline.ihs.com/images/VipMasterIC/IC/MOTO/MOTOS13078/MOTOS13078-1.pdf?hkey=EC6BD57738AE6E33B588C5F9AD3CEFA7 Bruce
Dual TTL-ECL level translator gate https://4donline.ihs.com/images/VipMasterIC/IC/MOTO/MOTOS13078/MOTOS13078-1.pdf?hkey=EC6BD57738AE6E33B588C5F9AD3CEFA7 Bruce
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By
Bruce Griffiths
· #172283
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Tek TDS694C advice pls
Wrong, when calculating the impedance of a parallel R +C the 90 degree phase shift should be taken into account. The input impedance is actually closer to 550 ohms. Bruce
Wrong, when calculating the impedance of a parallel R +C the 90 degree phase shift should be taken into account. The input impedance is actually closer to 550 ohms. Bruce
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Bruce Griffiths
· #171392
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Tek 603 - question on transistor heatsinking material
I have some pink tinted alumina TO3 insulators as well as some blue tinted beryllia ones from the 1970's. The beryllia ones are much colder to the touch than the alumina ones. Bruce
I have some pink tinted alumina TO3 insulators as well as some blue tinted beryllia ones from the 1970's. The beryllia ones are much colder to the touch than the alumina ones. Bruce
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Bruce Griffiths
· #168878
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577D1 itching issue - Haven't touched since, currently in storage
Matched loads aren't usually used at mains frequencies. Bruce
Matched loads aren't usually used at mains frequencies. Bruce
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Bruce Griffiths
· #162590
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tektronix 7S14 batteries and time base question
For greatest photocurrent in the detector LED, first choose the detector LED for 1.3V and then choose the emitter so that its peak emission is around 50nm shorter in wavelength than the emission from
For greatest photocurrent in the detector LED, first choose the detector LED for 1.3V and then choose the emitter so that its peak emission is around 50nm shorter in wavelength than the emission from
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Bruce Griffiths
· #162452
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tektronix 7S14 batteries and time base question
The peak response of a LED acting as a photodiode occurs at a shorter wavelength than its peak emission. Thus using a pair of red (or green, or blue etc) LEDs isn't the most effective combination. I h
The peak response of a LED acting as a photodiode occurs at a shorter wavelength than its peak emission. Thus using a pair of red (or green, or blue etc) LEDs isn't the most effective combination. I h
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Bruce Griffiths
· #162449
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tektronix 7S14 batteries and time base question
Hi Dennis Some issues with the 7S14 sampler circuit schematic (1988 version) 1) The avalanche bias adjust circuitry shown in the schematic doesnt work. The 470 ohm resistor should be connected between
Hi Dennis Some issues with the 7S14 sampler circuit schematic (1988 version) 1) The avalanche bias adjust circuitry shown in the schematic doesnt work. The 470 ohm resistor should be connected between
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Bruce Griffiths
· #162427
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tektronix 7S14 batteries and time base question
The 7S14 uses a 2K resistor in series with each battery. 20uA photocurrent implies a slope resistance of around 2.5K for a photodiode with n =2. This more than doubles the series resistance and adds s
The 7S14 uses a 2K resistor in series with each battery. 20uA photocurrent implies a slope resistance of around 2.5K for a photodiode with n =2. This more than doubles the series resistance and adds s
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Bruce Griffiths
· #162419
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tektronix 7S14 batteries and time base question
That's 2 series connected silicon photodiodes with a shunt capacitor per battery. Bruce
That's 2 series connected silicon photodiodes with a shunt capacitor per battery. Bruce
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Bruce Griffiths
· #162407
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tektronix 7S14 batteries and time base question
You'll need to series stack a couple of silicon photodiodes for that to work. The photocurrent will need to be around 50 microamps or so to keep the output resistance low enough. A shunt capacitor may
You'll need to series stack a couple of silicon photodiodes for that to work. The photocurrent will need to be around 50 microamps or so to keep the output resistance low enough. A shunt capacitor may
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Bruce Griffiths
· #162406
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tektronix 7S14 batteries and time base question
Just use SMT LEDs. However the photocurrent will need to at least 50 uA to ensure that output impedance is low enough. A shunt capacitor across the output LED may also be required. Bruce
Just use SMT LEDs. However the photocurrent will need to at least 50 uA to ensure that output impedance is low enough. A shunt capacitor across the output LED may also be required. Bruce
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Bruce Griffiths
· #162404
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tektronix 7S14 batteries and time base question
If its intended as a Mercury battery replacement in the 7S14 the output impedance is important, if its more than a few hundred ohms it will have a significant effect on the preamp dynamics. The output
If its intended as a Mercury battery replacement in the 7S14 the output impedance is important, if its more than a few hundred ohms it will have a significant effect on the preamp dynamics. The output
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Bruce Griffiths
· #162399
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tektronix 7S14 batteries and time base question
That's not efficiency, as its not the ratio of power out to power in. The efficiency is actually significantly less than your calculation indicates. Your "efficiency" is irrelevant if you are attempti
That's not efficiency, as its not the ratio of power out to power in. The efficiency is actually significantly less than your calculation indicates. Your "efficiency" is irrelevant if you are attempti
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By
Bruce Griffiths
· #162392
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tektronix 7S14 batteries and time base question
LED encapsulation is clear epoxy. Clear epoxy is best suited to bonding LEDs end to end. Either mechanical preparation of the mating surfaces or priming is required. Done properly the roughened ends a
LED encapsulation is clear epoxy. Clear epoxy is best suited to bonding LEDs end to end. Either mechanical preparation of the mating surfaces or priming is required. Done properly the roughened ends a
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Bruce Griffiths
· #162369
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2465 Fan Collet Thingy
Hybrid laser sintering and machining: https://www.lumex-matsuura.com/english/about N.B. for Titanium powder an inert atmosphere is required to avoid catastrophic fires. Bruce
Hybrid laser sintering and machining: https://www.lumex-matsuura.com/english/about N.B. for Titanium powder an inert atmosphere is required to avoid catastrophic fires. Bruce
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Bruce Griffiths
· #161647
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2465 Fan Collet Thingy
You mean something like this?: https://www.sciaky.com/additive-manufacturing/electron-beam-additive-manufacturing-technology Bruce
You mean something like this?: https://www.sciaky.com/additive-manufacturing/electron-beam-additive-manufacturing-technology Bruce
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Bruce Griffiths
· #161642
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HV Probe and DMM Input Impedance
The simplest solution is to multiply the DVM readings by 110. Otherwise shunting the 1090M resistor to reduce its resistance to 990M would be required. With DVMs that have the option of a very high in
The simplest solution is to multiply the DVM readings by 110. Otherwise shunting the 1090M resistor to reduce its resistance to 990M would be required. With DVMs that have the option of a very high in
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Bruce Griffiths
· #161165
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HV Probe and DMM Input Impedance
Likely intended for use with a Heathkit VTVM or similar which had an 11M input R (!M in standard probe tip) 10M in internal divider. Once the HV probe is substituted for the standard probe rge scaling
Likely intended for use with a Heathkit VTVM or similar which had an 11M input R (!M in standard probe tip) 10M in internal divider. Once the HV probe is substituted for the standard probe rge scaling
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Bruce Griffiths
· #161156
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TDS460A Will not turn on?
The HP optoelectronics handbook contained data on designing for aging of LEDs in optocouplers so they saw this as a real phenomenon. Bruce
The HP optoelectronics handbook contained data on designing for aging of LEDs in optocouplers so they saw this as a real phenomenon. Bruce
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Bruce Griffiths
· #159147
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7000 series carrying handles - how strong are they?
Not quite correct. austenitic stainless (300 series) is non magnetic. Martensitic (eg 422, 440 and 17-4PH etc) and ferritic grades are magnetic. Hardened martensitic stainless is stronger than austeni
Not quite correct. austenitic stainless (300 series) is non magnetic. Martensitic (eg 422, 440 and 17-4PH etc) and ferritic grades are magnetic. Hardened martensitic stainless is stronger than austeni
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By
Bruce Griffiths
· #159083
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