Comparison

Equip by PC&D vs 555 Timer & Oscillators Guide

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Equip by PC&D

Access a library of training videos for physical plant maintenance. Order necessary equipment for your facility and easily contact support for any additional needs.

Highlights
  • Training video library
  • Equipment ordering
  • Facility maintenance resources
  • Direct contact support
Features
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Equip by PC&D is your one stop shop for all things physical plant maintenance. Access our ever growing library of training videos, order equipment for your facility, and contact us for anything else you might need. Mobile app version: 6.23.8

About

555 Timer & Oscillators Guide

Features
Read full description

Master the design of oscillators and waveform generators using 555 timer integrated circuits, digital logic integrated circuits, operational amplifiers, and transistors. The application provides a comprehensive collection of over 130 tutorials and circuit diagrams, covering 555 timer circuits and practical applications, CMOS 4000 series logic oscillators, TTL 74LS and 74HC series oscillators, operational amplifier–based waveform generators, and transistor multivibrators. Designed for electronics beginners, students, hobbyists, and professional engineers, the app serves as a complete reference and learning tool for designing, understanding, and building oscillators, multivibrators, pulse generators, and waveform circuits commonly used in both analog and digital electronics. In addition to tutorials and schematics, the app includes built-in calculators for frequency, timing, duty cycle, and component value estimation, helping users quickly calculate and adjust circuit parameters. All topics are presented with clear circuit diagrams and detailed explanations. Available in 14 Languages: • English, French, German, Indonesian, Italian, Japanese, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Turkish, Ukrainian, and Vietnamese — study in your native language! Covered Topics: • 555 Timer IC Series • Astable, monostable, and bistable modes • Pulse Width Modulation (PWM) • Voltage conversion circuits • Sensor and external module interfacing • CMOS Logic Oscillators • CMOS 4000 series circuits • Astable, monostable, and bistable modes • Gated CMOS oscillators • TTL / HC Logic Oscillators • TTL 74LS series circuits • 74HC series logic oscillators • Astable and monostable modes • Operational Amplifier Oscillators • Sine wave generators • Square-wave pulse generators • Triangle wave generators • Transistor-Based Oscillators • Transistor-Based Astable multivibrators • Transistor-Based Monostable multivibrators The content is regularly updated and expanded with each new release, ensuring the latest tutorials and circuit examples are always available.

Screenshots

Equip by PC&D4 screens
555 Timer & Oscillators Guide4 screens

Verdict

The call

The clearest difference is ads: Equip by PC&D at none against 555 Timer & Oscillators Guide's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Equip by PC&D ships an update every 3 months, 555 Timer & Oscillators Guide every 5 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

Scorecard1 real difference · 8 level
Equip by PC&D versus 555 Timer & Oscillators Guide: the parameters behind the verdict, then further details
ParameterEquip by PC&D555 Timer & Oscillators Guide
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 3 months — betterEvery 5 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.1 — better16.0
Further details — not scored
Size56 MB24 MB
Age rating4+4+
DeveloperProvidence Consulting & Design, LLCALG Software Lab

In-app purchases

None

Equip by PC&D

No in-app purchases

None

555 Timer & Oscillators Guide

No in-app purchases

Questions

Is Equip by PC&D free?
Equip by PC&D is free to download, with no in-app purchases.
Is 555 Timer & Oscillators Guide free?
555 Timer & Oscillators Guide is free to download, with no in-app purchases.
Do Equip by PC&D or 555 Timer & Oscillators Guide have ads?
555 Timer & Oscillators Guide shows ads; Equip by PC&D does not.
Which is updated more often, Equip by PC&D or 555 Timer & Oscillators Guide?
Equip by PC&D ships an update every 3 months, and 555 Timer & Oscillators Guide every 5 months. Most recently, Equip by PC&D was updated on October 24, 2026 and 555 Timer & Oscillators Guide on October 27, 2026.

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