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Negative Lime T-800
Controls
Properties
Availability & Pricing
| Distributor | Qty 1 | |
|---|---|---|
| Digi-Key | $1.16–$1.81 | |
| LCSC | $2.20 | |
| Mouser | $1.13 | |
Assets
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steven-monge
copilot
- Objective: Ensure all components are correctly placed and soldered.
- Steps:
- Verify each component's placement against the schematic.
- Check solder joints for cold solder or short circuits.
Step 2: Component Verification- Objective: Confirm each component is the correct part and is functional.
- Steps:
- Measure resistance of R1 $47k\Omega$ and R2 $500\Omega$. Ensure they match specified values.
- Use a diode tester to verify the forward voltage of LED1, D1, and D2. Expect close to 1.7V for LED1 and D1, D2 as per their forward voltage rating.
- Confirm the transistor Q1 is in good condition by measuring its base-emitter and base-collector junctions with a diode test.
Step 3: Power Supply Verification- Objective: Ensure the power supply is correctly connected and provides the right voltage.
- Steps:
- Without connecting BATT1, measure the battery voltage to ensure it is around 3V.
- Connect BATT1 and measure voltage across its terminals on the board to verify proper connection.
Step 4: Biasing and Initial Power-Up- Objective: Apply power and establish basic circuit functionality.
- Steps:
- Apply power by connecting BATT1.
- Measure voltage at Q1:E $Emitter of Q1$ to ensure it's close to 0V, indicating Q1 is off initially.
Step 5: Testing LED1 Circuit- Objective: Verify that LED1 lights up under the correct conditions.
- Steps:
- Connect a function generator to Q1:B $Base of Q1$ with a small AC signal to simulate driving.
- Observe LED1. It should light up when Q1 is biased on, indicating current flows through LED1 and R2.
Step 6: Testing Diode Functionality- Objective: Ensure D1 and D2 function properly within the circuit.
- Steps:
- Measure voltage drop across D1 and D2 to ensure they match the expected forward voltage under operating conditions.
- Verify that D1 and D2 do not conduct in reverse bias by measuring the voltage across them when Q1 is off.
Step 7: Signal Path Verification- Objective: Confirm the signal flows as intended through the circuit elements.
- Steps:
- Inject a signal at Q1:B and measure the waveform at LED1:A, LED1:K, and then at each diode $D1:A, D2:A$ to ensure signal integrity and expected behavior.
- Check for signal distortion or unexpected voltage levels that may indicate an issue.
Additional Tips: