# Saylor Innovations 555 Timer Calculator

> Saylor Innovations 555 Timer Calculator is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).

Calculates 555 timer circuit parameters — frequency, duty cycle, pulse width, and E24 resistor values — for astable or monostable configurations

## Facts

- Endpoint: GET https://saylorinnovations.com/api/electronics/timer-555?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-555-timer-calculator-14b91d35
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fswKKILM8cK3MCVE4HJKY

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability saylor-innovations-555-timer-calculator-14b91d35
```

Example prompt: Can you calculate the 555 timer resistor and component values for an astable oscillator running at 1kHz with a 60% duty cycle using a 100nF capacitor?

## When to prefer this

Use this endpoint when designing or verifying 555 timer circuits and needing standard E24 component values matched to a target frequency, duty cycle, or pulse width. It is ideal for electronics engineers, hobbyists, or AI agents building hardware design tools. Prefer this over generic calculators when you want E24 resistor-snapped results for both astable and monostable modes in a single API call.

## Known failure modes

- Missing required mode parameter defaults to astable — may return unexpected results if monostable was intended
- Out-of-range duty cycle (outside 51–95%) may return error or be clamped to defaults
- Incompatible combinations of R1, R2, C, and target frequency may yield no valid E24 solution
- Non-numeric or malformed parameter strings (e.g. invalid scientific notation) will cause parse errors
- Very high or very low frequency targets may exceed practical 555 timer limits and return no solution

## How this service works

Frequency, duty cycle, pulse width or the E24 resistor values to hit a target

## Output

Returns computed 555 timer circuit parameters including operating frequency (Hz), duty cycle (%), pulse width (seconds), and recommended E24 standard resistor values (R1, R2 in ohms) for the specified astable or monostable configuration.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "c_f": {
       "type": "string",
       "description": "optional timing capacitor in farads, for example 1e-7 (query)"
      },
      "mode": {
       "type": "string",
       "description": "optional astable (default) or monostable (query)"
      },
      "r1_ohm": {
       "type": "string",
       "description": "optional (query)"
      },
      "r2_ohm": {
       "type": "string",
       "description": "optional (astable) (query)"
      },
      "target_hz": {
       "type": "string",
       "description": "optional target frequency for astable design (query)"
      },
      "target_pulse_s": {
       "type": "string",
       "description": "optional pulse width for monostable design (query)"
      },
      "target_duty_percent": {
       "type": "string",
       "description": "optional duty cycle for design, 51-95, default 60 (query)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-555-timer-calculator-14b91d35/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)