Test Equipment
Test Equipment for the Radio Shack
Test Equipment
AVR Gated GPS Locked Frequency Counter/StandardWhat is it? The Gated GPS Locked Frequency Counter / Frequency Standard is a standalone unit that uses the 1PPS signal from a GPS module to calibrate its internal frequency and lock to it. It can then operate in two modes: Frequency Counter Mode measure external frequencies with GPS-calibrated accuracy Frequency Standard Mode provide a precise reference frequency An Si5351 module generates the reference frequency standard, while the GPS lock ensures exceptional long-term accuracy. Why did I make it? My old frequency counter was always a few Hz off. This project solves that problem using a dual 16-bit counter configured as a single 32-bit counter. The frequency to be measured is converted to a square wave, fed to the counter chip, and represented as a 32-bit binary number. An ATmega328 reads this value and converts it to the displayed measured frequency. Key Hardware Features: Input transistor amplifier on board Frequency standard output GPS connection via side SMA connector 20x4 LCD...
Test Equipment
Crystal Tester / Frequency Meter 1Hz-50Mhz (100Mhz )Acknowledgement : Credits to Wolfgang Buescher, DL4YHF for designing this project.(based on a work by James Hutchby, MadLab, 1996) What is it? The frequency counter kit can be used to measure frequencies from 1hz to 50mhz and also check quartz crystals. The Frequency counter has a onboard button which can access a menu to zero the scale, add or deduct an offset in case it will be used in a shortwave receiver. The pcb is well labelled and makes it very easy to assemble it. Features : frequency range 1 Hz ... 50 MHz five digits resolution (display for example x.xxxx kHz, x.xxxx MHz, or xx.xxx MHz) automatic range switching with different gate times optional addition or subtraction of a frequency offset (programmable) optional preamplifier for the input signal very low component count: a PIC 16F628, 5 7-segment LED displays, a 20-MHz crystal and a few resistors optional (configurable) power-saving mode which automatically turns the display off if the frequency didn't change significant...
Test Equipment
Dual NTP ClockDual Clock displaying local time and UTC Time using an internet connection via WIFI 2.4g to connect and retreive the time and date using the network time protocol. The unit has multiple featues such as displaying the temperature and humidty through the onboard DHT11 Sensor and also configuration is possible through the serial terminal menu. It has onboard serial to USB Interface an a Lipo charger accepting one lipo cell .
Test Equipment
G3UUR Crystal Test OscillatorSorting surplus crystals for a homebrew SSB filter? A nanoVNA alone won't give you the 1 Hz precision you need. This compact PCB implements the classic G3UUR crystal test oscillator. Used with a good frequency counter, it measures series resonance and motional parameters (Lm, Cm, Cp, Q) of individual crystals letting you match batches to within 50 Hz. Design ladder, Cohn, or QER filters using real data, not guesses. PCB only; components not included.
Test Equipment
H.F Crystal Marker - CalibratorPrecision Frequency Calibration from 32MHz Down to 62.5kHz Achieve accurate, reliable calibration across the entire HF spectrum and beyond with this versatile crystal marker generator. Unlike traditional calibrators that offer limited marker intervals, this unit provides a comprehensive suite of output frequencies to meet all your alignment needs. Key Output Frequencies: 32 MHz, 16 MHz, 8 MHz Strong, unmistakable harmonic markers for the upper HF bands 4 MHz, 2 MHz, 1 MHz Primary reference points for general receiver calibration 500 kHz, 250 kHz, 125 kHz Finer interpolation for improved dial accuracy 62.5 kHz Fine-resolution markers for precise low-frequency and medium-wave calibration Crystal-Controlled Accuracy Built around a high-stability quartz crystal oscillator, this calibrator delivers rock-solid frequency references that won't drift. The fundamental frequency is divided down through precision CMOS logic to generate the full range of marker outputs, eliminating the need for ...
Test Equipment
Inductance-Capacitance Meter AVRNobcha LC Meter for accurate measurement of inductance (L) and capacitance (C). Fast, stable, and easy to use, ideal for testing components, matching coils and capacitors, and troubleshooting electronic circuits. Supplied assembled and ready to use.
Test Equipment
Opto Isolator TesterOpto Isolator tester for 4 pin and 6 pin devices
Test Equipment
Precision AVR Inductance/Capacitance MeterL/C/CE Meter Precision Inductance, Capacitance, and Electrolytic Capacitor Meter Measure L, C, and CE electrolytic capacitors with high accuracy. The L/C/CE Meter is a versatile, open-source handheld instrument designed for measuring inductance (L), capacitance (C), and electrolytic capacitors up to 10,000 µF with exceptional precision. Perfect for electronics hobbyists, repair technicians, and engineers. Why choose this meter? Unlike cheap multimeters with limited capacitor range, this dedicated L/C/CE meter covers everything from tiny 1 pF ceramic caps to large 10,000 µF electrolytic and tantalum capacitors. It also measures inductors from 0.1 µH to 1 H, making it an indispensable tool for any electronics workbench. Key Features: Wide Measurement Ranges Inductance (L): 0.1 µH 1 H Capacitance (C): 1 pF 10,000 µF (includes electrolytic and tantalum capacitors) High Accuracy & Smart Features Calibration menu for precise readings Compensation menu for lead and parasitic cancellation T...
Test Equipment
Transistor Curve TracerCompact Transistor Curve Tracer Tester with 2.8" TFT touch display for analyzing and displaying transistor characteristics. Supports testing and matching of transistors, MOSFET threshold measurement, JFET cutoff, diode forward voltage, and Zener breakdown. Supplied fully assembled, tested, and ready to use. Operates on 9 12V DC with serial output support.
Test Equipment
Transistor Curve Tracer - ProcessorTransistor Curve Tracer Processor - Programmed and Tested
Test Equipment
USB Power Bank Keep AliveUSB Keep Alive Stop Powerbanks from Turning Off Available in USB-A models, the USB Keep Alive is the ready-to-use version of our popular through-hole kit. It s designed for those who want a reliable, pre-assembled solution without any soldering. How It Works The device sends a periodic 100mA power pulse. When used alongside another low-power device, this small draw is typically sufficient to prevent a powerbank from entering standby mode and shutting down. Key Benefits Compact & Ready: No assembly required just plug and play. Common Applications Charging hearing aids and earbuds Time-lapse photography Any situation where a powerbank auto-shuts off Important Considerations Compatibility: Works with standard 5V devices only. It is not compatible with Power Delivery (PD) or Quick Charge (QC) adapters, which may cause damage. Dual-Device Requirement: The Keep Alive cannot function alone; it must be used with another device drawing a small amount of power.
