low cost spectrometer ish ALTA II tear down

more about it

https://www.lpi.usra.edu/education/products/spectrometer/

my two cents

cheaper to build it yourself and it will probably be just as good

 

3d touch sensor tear down

magnetic range sensor with coil

teardown wavetek meterman sf10 short finder brush

 not much in here just two 555 timers and lm324 op amp

TL555C Description

The TLC555 is a monolithic timing circuit fabricated using the TI LinCMOS™ process. The timer is fully compatible with CMOS, TTL, and MOS logic and operates at frequencies up to 2 MHz. Because of its high input impedance, this device supports smaller timing capacitors than those supported by the NE555 or LM555. As a result, more accurate time delays and oscillations are possible. Power consumption is low across the full range of power-supply voltage. Like the NE555, the TLC555 has a trigger level equal to approximately one-third of the supply voltage and a threshold level equal to approximately two-thirds of the supply voltage. These levels can be altered by use of the control voltage terminal (CONT). When the trigger input (TRIG) falls below the trigger level, the flip-flop is set and the output goes high. If TRIG is above the trigger level and the threshold input (THRES) is above the threshold level, the flip-flop is reset and the output is low. The reset input (RESET) can override all other inputs and can be used to initiate a new timing cycle. If RESET is low, the flipflop is reset and the output is low. Whenever the output is low, a low-impedance path is provided between the discharge terminal (DISCH) and GND. All unused inputs must be tied to an appropriate logic level to prevent false triggering.

LM324M Description

The LM124-N series consists of four independent, high-gain, internally frequency compensated operational amplifiers designed to operate from a single power supply over a wide range of voltages. Operation from split-power supplies is also possible and the low-power supply current drain is independent of the magnitude of the power supply voltage. Application areas include transducer amplifiers, DC gain blocks and all the conventional op amp circuits which now can be more easily implemented in single power supply systems. For example, the LM124-N series can directly operate off of the standard 5-V power supply voltage which is used in digital systems and easily provides the required interface electronics without requiring the additional ±15 V power supplies.

LM324M pulse response

TL555C pulse characteristics

diy version

just used a braided 10 awg non coated wire

and connect it to a multimeter in continuity mode

meters that dont have a dedicated continuity mode will be slower in their response

teardown wireless serial adapter hps-120

teardown handyware handyport hps-120 serial transceiver
download datasheet link

General Descriptions:

The HPS-120 from HandyWave is a ready-to-use short-range wireless connectivity solution for

industrial. It provides the most economic and powerful way of cable replacement for the serial

communication systems.

1.2. Key Features

 No need of external host and software

 Easy of installation and use

 Supports configuration of the local device

 Supports configuration of the remote device via Over-the-Air

 Easy of maintenance

 Supports up to 100 meter (Line of Sight)

 Supports RS-232

 Supports Point-to-Point and Point-to-Multipoint Topology

1.3. Key Specifications

 Operation Frequency: 2.4GHz ISM Band

 Transmitted Power: Max 20 / Typical 16dBm

 Received Sensitivity: More than –80dBm

 Power Supply: DC +5 ~ +12V

 Current Consumption: Up to 200mA at DC 5V

 Operation Temperature: -20 ~ 70 C

 Dimension (w/o antenna): 35mm (W) x 65mm (D) x 16mm (H)

 Baud Rate: 1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 57.6, and 115.2Kbps

 Antenna Interface: SMA Female

 Signal Interface: D_SUB 9 Pin Female

The SP3222E and SP3232E series are RS-232 transceiver solutions intended for portable or hand-held applications such as notebook or palmtop computers.
The SP3222E / SP3232E series has a highefficiency, charge-pump power supply that requires only 0.1µF capacitors in 3.3V operation.
This charge pump allows the SP3222E / SP3232E series to deliver true RS-232 performance from a single power supply ranging from 3.0V to 5.5V.
The SP3222E / SP3232E are 2-driver / 2-receiver devices.
This series is ideal for portable or hand-held applications such as notebook or palmtop computers.
The ESD tolerance of the SP3222E / SP3232E devices are over ±15kV for both Human Body Model and IEC61000-4-2 Air discharge test methods.
The SP3222E device has a low-power shutdown mode where the devices’ driver outputs and charge pumps are disabled.
During shutdown, the supply current falls to less than 1µA.

BC417143B interfaces to 8Mbit of external Flash memory. 

When used with the CSR Bluetooth software stack, it provides a fully compliant Bluetooth system to v2.0 of the specification for data and voice communications.. 

System Architecture BlueCore4-External has been designed to reduce the number of external components required which ensures production costs are minimised. 

The device incorporates auto-calibration and built in self test (BIST) routines to simplify development, type approval and production test. 

All hardware and device firmware is fully compliant with the Bluetooth v2.0 + EDR specification (all mandatory and optional features). 

To improve the performance of both Bluetooth and 802.11b/g co-located systems a wide range of co-existence features are available including two types of hardware signalling: basic activity signalling and Intel WCS activity and channel signalling

Some FCC Data (RUSHPS-120)