FAQ
TL;DR: A modular set of mini debugging boards (e.g., a 40 A relay module) helps you switch, drive, and translate signals fast—“I designed these circuit debugging tools.” [Elektroda, Shawn Razek, post #21667807]
Why it matters: You can quickly prototype or troubleshoot power and logic stages without spinning a new PCB, ideal for learners and pros.
Quick Facts
- Available modules include H-bridge, level translator, ~20 A N-MOSFET, ~17 A P-MOSFET, 40 A relay, and triac with zero‑cross driver. [Elektroda, Shawn Razek, post #21667807]
- Custom builds offered: triac with/without zero-cross, push button pull-up or pull-down, and relays with AC coils. [Elektroda, Shawn Razek, post #21667809]
- Connector note: 100 mil headers can bend and need high insertion force; spring-loaded board connectors were suggested. [Elektroda, Joe Wolin, post #21667810]
- Real-world load: users discussed 2.4 kW, 240 V/50 Hz resistive fry-pan heaters (≈10 A). [Elektroda, Rodney Green, post #21667813]
- Project update: “20 different Simple Circuits” launched via Kickstarter on June 12, 2013. [Elektroda, Shawn Razek, post #21667819]
What are these “mini tools,” and who should use them?
They are small, single‑purpose boards to switch, drive, buffer, toggle, amplify, and level‑translate signals. They suit students, prototypers, and engineers who need quick test fixtures without custom PCBs. Think LEGO‑style modules for bench debugging and building blocks in early design. [Elektroda, Shawn Razek, post #21667807]
Which modules exist right now?
The initial set includes an H‑bridge driver, level translator, ~20 A N‑channel FET, ~17 A P‑channel FET with N‑FET gate drive, an instrumentation amplifier with 2.5 V virtual ground, push buttons (standard and Schmitt), a 40 A 110/220 VAC relay, a triac on heatsink with zero‑cross opto driver, a high‑voltage bidirectional detector, and a 5 V over‑voltage clamp. “It’s a great idea!” [Elektroda, Shawn Razek, post #21667807]
Can I request custom configurations (zero‑cross, pull‑down, AC coil)?
Yes. The plan is to let buyers order boards with tailored options, such as triac modules with or without zero‑cross, push buttons with pull‑up or pull‑down, and relays with AC coils. This customization helps beat generic clones and justifies pricing. [Elektroda, Shawn Razek, post #21667809]
How do these boards connect—do I have to use 100 mil headers?
Standard 100 mil headers work but have drawbacks: high insertion force and bent pins. A participant recommended spring‑loaded board‑to‑board connectors and a standard footprint so people can design against one connection scheme. “Keep up the good work.” [Elektroda, Joe Wolin, post #21667810]
What does a "triac with zero‑cross opto‑isolated driver" do?
A triac switches AC loads; a zero‑cross driver turns on near the AC zero crossing to reduce EMI and stress. Opto‑isolation protects your control side. This configuration helps when controlling resistive mains loads like heaters or lamps during tests and demos. [Elektroda, Shawn Razek, post #21667807]
What is a level translator and when would I use it?
A level translator shifts logic levels between systems, for example 3.3 V microcontrollers and 5 V peripherals. Use it when your signal source and destination disagree on what counts as HIGH or LOW. It prevents misreads and protects I/O pins. [Elektroda, Shawn Razek, post #21667807]
How does the H‑bridge driver help with motor testing?
An H‑bridge lets you drive a DC motor forward or reverse and control braking. As a mini tool, it simplifies swapping drivers during debug, so you can isolate motor, wiring, and control logic issues quickly without respinning boards. [Elektroda, Shawn Razek, post #21667807]
When should I pick N‑channel vs P‑channel MOSFET modules?
Use N‑channel for low‑side switching and better Rds(on) per cost; use P‑channel for simple high‑side switching at moderate current. The P‑channel module includes an N‑FET gate drive helper, easing control from logic sources during prototyping. [Elektroda, Shawn Razek, post #21667807]
What does the instrumentation amplifier board provide?
It offers precision gain with a stable 2.5 V virtual ground to handle small differential signals, including those that swing below ground. This makes sensor bring‑up faster and cleaner on the bench during mixed‑signal debugging. [Elektroda, Shawn Razek, post #21667807]
Can I build a simple external control for a 2.4 kW fry‑pan heater?
Yes, several users discussed bypassing the pan thermostat and using an external triac‑based controller for a 2.4 kW, 240 V/50 Hz resistive load (≈10 A). Note that open‑loop dimming doesn’t regulate temperature tightly and can swing. [Elektroda, Rodney Green, post #21667813]
Should I choose a PID temperature controller or a simple AC dimmer?
A PID temperature controller with a probe adds automation and stability. An AC “speed controller” (dimmer) is cheaper but open‑loop. One contributor noted far‑east units are inexpensive and may ship in 2–3 weeks. Pick based on accuracy needs. [Elektroda, Frank Bushnell, post #21667816]
Is there a known failure or edge case I should watch for?
Kitchen thermostats with bimetal strips can oscillate wildly, cycling between “stinking hot” and almost cold. Replacing them with external control can reduce swings, but open‑loop dimming still lacks feedback and may drift under varying loads. [Elektroda, Rodney Green, post #21667811]
How do I quickly prototype with these mini tools?
Try this three‑step approach:
- Power the module with the specified logic or supply.
- Route I/O through the module (e.g., level translate or switch the load).
- Measure results and iterate wiring or gain settings.
This reduces rework during bring‑up. [Elektroda, Shawn Razek, post #21667807]
Any connector best practices for a robust bench setup?
Minimize repeated insertions on 100 mil headers to avoid bent pins. Consider spring‑loaded board‑to‑board connectors for frequent swaps. Define a consistent pinout across modules so you can rewire less and test faster. [Elektroda, Joe Wolin, post #21667810]
Where can I track updates or support the project?
The creator reported launching “20 different Simple Circuits” via Kickstarter and invited feedback. Check that announcement for details and ongoing progress notes from the team. [Elektroda, Shawn Razek, post #21667819]
