Blue Ring Tester Schematic Diagram Exclusive !full! ๐ฅ Certified
+9V to +12V DC Input โ [ ] R1 (10k) โ โโโโโโโโโโโโโ โ โ โ [ ] [ ] [ ] R4 (47k) R2 [ ] [ ] R3 [ ] (10k) โ โ(10k) โ LM3914 LED Driver โ โ โ โโโโโโโโโโโโโโโโโโโ Pulse Input โโโโโผโโโโโโโโผโโโโบโ Pin 5 (Signal) โ (From MCU/555) โ โ โ โ โ โ [ ] [ ] === โ Pin 1 -> LED 1 โ [ ] R5 [ ] [ ] C2 โ Pin 10 -> LED 10โ [ ] (1k) โ โ (1nF) โโโโโโโโโโฌโโโโโโโโโ โ โ โ โ โ โโโโโโโโโโดโโโโโโโโโโโ โ โ โ โ โ โ โ โ โ โ ===== C1 โโโ โ โ โ [ ] R6 (10nF) โ โโโผโโโโโโโโโ โ [ ] (22k) โ โ โ โ โ โ LM393โ โ โ โโโโโโโโโโโโดโโบ(Inv) โโโโโ โ โ (Non) โ โ [โ] Test โฒ โ โ [โ] Probes โโโโโโ โ โ โ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโดโโโ GND Components List IC1: LM393 (Low Power Dual Voltage Comparator) IC2: LM3914 (Dot/Bar Display Driver) Resistors: R1, R2, R3: 10kฮฉ (Metal Film, 1/4W) R4: 47kฮฉ (1/4W) R5: 1kฮฉ (1/4W) R6: 22kฮฉ (1/4W) Capacitors:
Modern exclusive schematics utilize a pre-programmed microcontroller to handle the counting and display cleanly:
: The device counts the number of oscillations that exceed a specific voltage threshold. This count is then translated into the number of lit LEDs on the display. Practical Application and Limitations
A reference voltage is established using a voltage divider (e.g., set to roughly 100mVโ150mV above ground).
This article provides an exclusive, comprehensive breakdown of the Blue Ring Tester circuit schematic diagram, explains its underlying engineering principles, and gives you a step-by-step guide to building your own high-precision diagnostic tool. The Core Concept: What is "Ringing"? blue ring tester schematic diagram exclusive
: PIC16F628A or ATtiny2313 (programmed with Ring Tester firmware). Comparator : LM393 (Dual differential comparator).
| Symptom | Likely Cause | Solution | |---------|--------------|----------| | Both LEDs off | No power or dead 555 | Check voltage across pin 1 & 8 of U1. Should be 9V. | | Green LED always on | Comparator stuck high | Check R4, R6. Possibly C4 shorted (replace). | | Red LED always on | No ringing signal | Probe test points with scope. Is the 555 pulsing? | | Inconsistent results | Poor probe connections | Use shorter, thicker leads. Solder alligator clips. | | False positives on large coils | Insufficient pulse energy | Increase C2 to 22nF or reduce R3 to 68ฮฉ (do not go lower). |
: A momentary push-button switches a current pulse through a
The commercial Blue Ring Tester (originally designed by Bob Parker and sold by AnaTek) uses a cleverly simple circuit that later inspired countless DIY versions. The core principle can be broken down into four stages: +9V to +12V DC Input โ [ ]
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The design below is an optimized, discrete-logic variant of the classic Dick Smith Electronics (DSE) K-7205 kit. It utilizes a highly stable LM393 voltage comparator to digitize the analog ring pulses and an LED bar graph driver to display the results. Circuit Layout Description
Ignition coils operate at high voltage and are prone to internal arcing (carbon tracking) which creates a shorted turn. Test them out of the vehicle with this circuit.
: If the inductor is healthy (high Q), the oscillations will decay slowly, creating a long train of pulses (ringing). If the inductor has a shorted turn, the energy is quickly dissipated as heat within the short, causing the oscillations to damp out almost immediately. Comparator : LM393 (Dual differential comparator)
The coil is healthy, has high inductance retention, and no shorted turns. Construction and Calibration Tips
Usually 6 to 8 LEDs ranging from Red (bad) to Blue (excellent). How the Schematic Works
A Blue Ring Tester is a specialized electronic instrument designed to perform a quick, non-destructive "health check" on high-frequency inductive components. Its primary purpose is to identify shorted turns within a coilโa common failure mode that is difficult to detect with a standard multimeter.
Below is the representation of the classic, highly efficient Blue Ring Tester circuit.