Ne555 Timer

{
  "asOf": "2026-10-11T08:33:11.726Z",
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "dutyCyclePct": 52.381,
  "formatted": {
    "frequency": "68.57 Hz",
    "period": "14.58 ms"
  },
  "frequencyHz": 68.571429,
  "highTimeS": 0.007623,
  "lowTimeS": 0.00693,
  "notChecked": [
    "CMOS versus bipolar 555 differences and supply voltage effects",
    "real component tolerance and capacitor leakage",
    "…1 more"
  ],
  "periodS": 0.014583333,
  "reasons": [
    "f = 1.44 / ((R1 + 2 R2) C); duty = (R1 + R2) / (R1 + 2 R2), always above 50% in the basic circuit.",
    "Use R1 much smaller than R2 to approach a 50% duty cycle."
  ],
  "source": "computed locally",
  "summary": "68.57 Hz (period 14.58 ms), duty cycle 52.38%: high 7.623 ms, low 6.93 ms.",
  "verdict": "ASTABLE"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://electronics-calc.x402tookit.com/ne555-timer?c=1u&mode=astable&r1=1k&r2=10k'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://electronics-calc.x402tookit.com/ne555-timer?c=1u&mode=astable&r1=1k&r2=10k' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Felectronics-calc.x402tookit.com%2Fne555-timer
const res = await pay("https://electronics-calc.x402tookit.com/ne555-timer?c=1u&mode=astable&r1=1k&r2=10k");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://electronics-calc.x402tookit.com/ne555-timer?c=1u&mode=astable&r1=1k&r2=10k")
    print(res.status_code, res.text)