| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 9B20.00 | Circuits/Components/Inst. | | |
| 9B20.10 | displacement transducer | AJP 56(7),665 | An optical wedge made with a strip of 35 mm slide film. |
| 9B20.11 | seismometer | AJP 32(11),xxiv | A ceramic phonograph pick-up modified to be a seismometer, drives a oscilloscope directly. |
| 9B20.13 | electrometer display | AJP 35(3),xxii | Use the recorder output of an electrometer to drive a projection meter or lecture table meter. |
| 9B20.13 | inexpensive electrometer amplifier | AJP 34(3),xxix | Circuit for an inexpensive transistor electrometer amplifier. |
| 9B20.13 | electrometer circuit | AJP 40(4),623 | A solid state electrometer circuit. |
| 9B20.13 | vacuum-tube electrometer | AJP 36(10),969 | Circuit for an inexpensive vacuum tube electrometer. |
| 9B20.13 | electrometer circuit | AJP 28(7),xiii | A three tube circuit to extend the range of a RCA Ultra-Sensitive DC Microammeter (Model WV-84A). |
| 9B20.14 | picoammeter | AJP 44(10),1016 | Circuit for a simple picoammeter with adjustable input potential. |
| 9B20.20 | versatile test instrument | AJP 34(7),vii | A circuit for a mercury pulser, sliding pulsar, and stable potentiometer. |
| 9B20.20 | calibrating meters | TPT 3(5),226 | Improves on TPT 3(2),78 (1965). Ammeter range switch and ohmmeter zero adjustment. |
| 9B20.20 | meter tester | TPT 3(2),77 | A tester to determine full scale current and internal resistance. |
| 9B20.21 | inexpensive student potentiometer | AJP 33(8),603 | A 0.1% student potentiometer and calibration source made from off the shelf parts. |
| 9B20.21 | null indicator circuit | AJP 35(10),xi | Add a battery and current limiting resistor to a bridge / microammeter null indicator. |
| 9B20.21 | metergard | AJP 35(7),iii | Protect your meter movements. |
| 9B20.23 | strain gauge | AJP 42(2),108 | Apparatus competition merit award looks like the precursor of the PASCO product. |
| 9B20.25 | precision voltage reference | AJP 52(1),86 | Use a precision voltage reference built with an LM399 for use as a Wheatstone bridge reference. |
| 9B20.28 | use mototcycle batteries | AJP 34(12),xvi | Motorcycle batteries are a convenient size. |
| 9B20.30 | infrared detector | AJP 30(6),vi | Data for the Block Associates KH-51 indium antimonide photoconductive infrared detector. |
| 9B20.30 | LED photometer | AJP 44(2),188 | A circuit for using an LED as a light detector. |
| 9B20.30 | photodiode photometer | AJP 46(10),1079 | A photodiode photometer based on the PIN-125 photodiode and 741 op-amp. |
| 9B20.30 | fringe intensity photometer | AJP 42(1),77 | Mount a photocell on a traveling microscope stage. |
| 9B20.30 | optical tachometer | AJP 28(6),563 | Simple photodiode circuit detects black and white sides of a spinning top. |
| 9B20.30 | photointerrupt module | AJP 41(7),931 | On using the GE A13A1 photointerrupt module. |
| 9B20.30 | solid state photometer | AJP 42(4),342 | A high sensitivity solid state photometer based on the MRD 14B photo Darlington and ULN 2157 op amp. |
| 9B20.30 | Pasco photogate evaluation | AJP 57(10),840 | Thorough evaluation of the Pasco photogate. |
| 9B20.30 | selective surface solar radiometer | AJP 52(6),550 | Black and white painted surfaces give directly an absolute determination of the solar irradiance. |
| 9B20.30 | photometer | AJP 35(12),ix | Make a photometer out of a meter and photosensitive resistance cell. |
| 9B20.30 | inexpensive photodensitometer | AJP 35(4),359 | Use a photodiode in conjunction with a x-y recorder to make a direct reading photodensitometer. |
| 9B20.30 | holography light meter | AJP 44(4),399 | A selenium photocell hooked to a microammeter will give the reference to object beam ratio. |
| 9B20.30 | small area photometer | AJP 38(8),987 | Simple photometer for measuring small light intensities over small areas. Suitable for single and multiple slit experiments. |
| 9B20.30 | optical radiation power meter | AJP 53(11),1108 | A new accurate power meter based on new 100% efficient silicon photodiodes |
| 9B20.30 | counting photons | AJP 34(3),240 | Counting photons, here for the optical barrier penetration experiment, with a liquid N2 cooled photomultiplier (1P21). |
| 9B20.30 | inexpensive photometer | AJP 55(12),1147 | A photoresistor with a LED that lights when a preset level is exceeded. Use neutral density filters to vary range. |
| 9B20.30 | light actuated PNPN switch | AJP 29(8),iv | "Photran" light switch from Solid State Products. (1961) |
| 9B20.30 | photomultiplier tube | A-101 | Using the recently developed electron multiplier photocell. Picture. |
| 9B20.35 | variable frequency switch | AJP 34(10),xv | A transistor switch in series with a dc supply is used as a audio amplifier where waveform requirements are not stringent. |
| 9B20.35 | V to F | AJP 44(12),1228 | Simple three transistor v to f converter. |
| 9B20.35 | transistor based opamp | AJP 37(5),566 | Make a low noise, high input impedance opamp with transistors. Circuit given. |
| 9B20.35 | mechanical model of a amplifier | A-86 | A mouse trap triggering a rat trap is a mechanical model of a two stage amplifier. |
| 9B20.35 | multistage tube amplifier | A-85 | Circuit diagram for a multistage tube amplifier. |
| 9B20.40 | temperature controller | AJP 31(2),xi | Control the temperature of small systems to 0.2 C using a photoresistor in the light beam of a galvanometer. |
| 9B20.40 | glass resistance thermometer | AJP 47(1),120 | Use ordinary glass instead of a carbon glass thermistor to construct a inexpensive resistance thermometer. |
| 9B20.40 | temperature controller | AJP 58(12),1210 | A circuit for a wide range temperature controller for solid samples. |
| 9B20.40 | millidegree temperature thermostat | AJP 45(3),311 | Millidegree temperature control in a double oven chamber. |
| 9B20.40 | low temp thermistors | AJP 29(6),v | Announcement of a bead type "Veco" thermistor good down to liquid nitrogen temperatures. |
| 9B20.40 | LM 34/35 temperature sensor | AJP 57(11),1049 | National Semiconductor LM34/35 temperature sensors have 10 mV/deg outputs. |
| 9B20.40 | inexpensive digital thermometer | AJP 49(6),599 | A digital thermometer based on the AD590 and A/D converter with 6 digit LED driver. |
| 9B20.40 | proportional temperature control | AJP 45(3),312 | Millidegree temperature controller. |
| 9B20.40 | differential thermostat | AJP 46(8),863 | A low cost differential thermostat developed for use in solar energy control. |
| 9B20.40 | simple diode radiometer | AJP 41(3),443 | Circuit for a simple diode (1N 5179) radiometer. |
| 9B20.45 | strain-gauge bridge | AJP 33(5),xvii | Circuit for a strain gauge bridge, used here to measure the deformation of a brass ring. |
| 9B20.45 | phono cartridge as transducer | AJP 43(2),155 | On the utility of inexpensive piezoelectric type phono cartridges as displacement transducers. |
| 9B20.50 | Motorola pressure transducer | AJP 53(11),1108 | A short note on the Motorola MPX100 pressure transducer. |
| 9B20.51 | simple pressure transducer | AJP 39(3),348 | The thickness of an optically dense dye between two anvils is measured electroptically. |
| 9B20.55 | electrohumidity transducer | AJP 30(4),xiv | A humidity sensor that changes resistance with humidity. |
| 9B20.55 | silica gel humidity sensor | AJP 53(10),1011 | The change of conductivity of silica gel is used to measure humidity. |
| 9B20.65 | LN2 level probe | AJP 46(2),192 | The
simplest probe is to blow on a meter stick which frosts up to the level of
the LN2. Also, a thermocouple on a rod connected to a microammeter or millivoltmeter
is inserted until the meter deflects. |
| 9B20.65 | low cost LN2 monitor | AJP 57(10),954 | A circuit monitors LN2 levels in a dewar. |
| 9B20.66 | flow detector | AJP 57(12),1153 | An optoswitch detects the ball in an inline ball flow indicator. |
| 9B20.70 | making solenoids | AJP 36(7),641 | Make a coil of 3500 turns of No. 16 wire. Data. |
| 9B20.70 | high Q inductors | AJP 34(5),x | High Q inductors from United Transformer Corp. are useful in demonstrating resonance at power line frequencies. |
| 9B20.70 | inexpensive coils | AJP 32(10),xvi | Focus
coils from old TV sets or field coils from old speakers are convenient due
to large opening and can usually be connected directly to 120 v ac. |
| 9B20.70 | making coils | AJP 40(7),1040 | Directions for winding coils for use with 10 v dc. |
| 9B20.70 | winding transformers | AJP 35(8),vi | Use Scotch tape between layers if you are trying to wind a transformer without a winder. |
| 9B20.71 | field stabilized electromagnet | AJP 57(2),184 | Transformer windings are used for the core of an electromagnet. |
| 9B20.75 | mercury-wetted contact relays | AJP 28(7),xiv | A catalog describing design features and operating characteristics. |
| 9B20.75 | photoelectric relays | A-97 | On using photocells to turn things on. Diagram. |
| 9B20.75 | photocell-thyratron relay | A-98 | On using photocells for sensitive control. Diagram. |
| 9B20.80 | electric and magnetic field probes | AJP 35(11),1047 | Electric and magnetic field probes where the strengths are presented audibly. Circuit diagrams. |
| 9B20.80 | Hall effect transducer | AJP 56(7),622 | Using integrated circuit Hall effect transducers. |
| 9B20.80 | hall effect sensor | AJP 54(1),89 | Using the Microswitch 91SS12-2 Hall effect sensor. |
| 9B20.90 | digital integrator | AJP 54(1),88 | A circuit starts with a VFC, ends with a counter. |
| 9B20.90 | negative feedback demonstration | AJP 49(4),374 | A very simple lamp, photocell, opamp circuit to demonstrate negative feedback. |
| 9B20.90 | Josephson junction analog | AJP 49(11),1035 | An electronic analog of a resistively shunted Josephson junction. |
| 9B20.90 | two component exponential decay circ | AJP 47(5),471 | A circuit provides a output composed of both fast (20 sec) and slow (100 sec) time constants. |
| 9B20.90 | integrator and differentiator | 30-2.8 | A circuit provides both RC integrating and differentiating circuits with 1 KHz square wave input. |
| 9B20.92 | digital logic monitor | AJP 46(8),866 | An LED on each pin shows the logic state of integrated circuits. |
| 9B20.92 | simple universal logic state checker | AJP 50(3),283 | A circuit for a simple universal logic state checker. |
| 9B20.95 | reverse sudden death lead | AJP 41(9),1117 | Make a breakout box with a standard duplex receptacle to banana plugs. |
| 9B20.99 | digital lecture hall display | AJP 46(9),952 | A circuit for a four digit LED display with 24 LEDs in each digit. |